Well, I didn't count them up, but here's a fairly comprehensive list for ya. And by the way, 50 Merc wheels should be 5 on 5.5, as many early Ford wheels were.
#studs/BC STUD SIZE COMMON APPLICATION
5 x 4.5" 1/2" Older Full size Ford & Chrysler Products
5 x 4.75" 7/16" Chevy Camero & Most Older Full Size Chevrolet
5 x 5" 5/8" Grand National & Most Older Full-Size GM Cars
5 x 5.5" 1/2" 1/2 Ton Ford Pickups, Most Jeeps, & International Scouts
6 x 5.5" 7/16" Older Model Chevy & GM Pickups, Some Late Blazer & Datsun
8 x 6.5" 1/2" All 8 Hole 3/4 Ton Trucks
5 x 7.75" 5/8" Old Wide 5 Hole Volkswagen
5 x 10.25" 5/8" Modified 37 Ford, Skeleton or Wide 5 Pattern
6 x 5" 6-Pin Sprint Car 5/8 Drive Pin
6 x 5" 6-Pin Midget 1/2" Drive Pin
4 x 98mm Fiat
4 x 100mm Chevy Chevette, Plymouth K-Car, Isuzu, & Renault
5 x 100mm All GM A, J, & X Body Front Wheel Drive some Mopar
4 x 4" Vega & GM '80 & Older Skyhawk, Starfire, Astro & Sunbird
5 x 4" Plymouth Duster, Scamp, Valiant, Dodge, "A" Body Mopar
4 x 4.25" Pinto, T-Birds, Other Ford Small Cars, Some Porsche
4 x 110mm Some Renault & Mazdas
4 x 4.5" Older Mustangs & Capri 6 Cyl, Some Datsun, MG, Mazda & Toyota
4 x 120mm Some Mazda & Honda
4 x 130mm Volkswagen & Some Porsche
4 x 140mm Subaru
5 x 6.5" Land Rover
5 Bolt Wheels
5 on 100mm (3.937")
Buick - Century, Skylark, Skyhawk FWD '79-'87
- LeSabre, Riviera, Somerset '85-'88
Chevrolet - Beretta, Citation, Cavalier, Celebrity, Corsica
'80-'89
Chrysler - Laser, Lebaron '85-'87
Dodge - Daytona, Aries, Charger, Lancer, Caravan '85-'89
Oldsmobile - Calais, Ciera, FWD '82-'87
- Firenza, Omega FWD '79-'86
Plymouth - Sundance '87-'89
Pontiac - 6000, Grand Am, J2000, Sunbird, etc. FWD '82-'87
- Fiero '82-'88
5 on 4 (101.6 mm)
'64-'69 Mopar "A" 13"
'65-'76 Mopar "A" 14"
Dodge - Aspen, Dart, Demon, Swinger (w/o discs) '63-'72Plymouth - Barracuda, Duster, Valiant (w/o discs) '61-'74
5 on 4-1/4 (108 mm)
Volvo 140, 164 15"
Volvo - all to '89
Ford - T-Bird '89
5 on 112mm (4.409")
Audi - 5000 Turbo, Quattro '86-'87
Mazda - RX7 GSL '86-'87
Mercedes - all '77-'89
VW - Transporter, Vanagon '71-'89
5 on 4-1/2 (114.3 mm)
AMC Gremlin, Hornet, Pacer, Javelin, Matator, AMX
AMC - most models (exc. Jeep) '40-'89
Chrysler/DeSoto - all full size RWD cars (exc. Imperial) '37-'89
Datsun/Nissan - 1600-2000 '65-'73
- 300ZX, 200SX V6 (some) to '89
Dodge van
Dodge 1/2 ton P.U.
Dodge - all full size cars & P.U.'s '37-'89
- Dart, Demon, Swinger '73-'80
Ford 1/2 ton van
Ford Granada, Monarch
Ford - All full size cars '49-'72; '79-'85
- Fairlane '62-'79
- T-Bird '55-'71; '77-'79
- Mustang 5-bolt '65-'73
- Maverick 5-bolt all
- Mustang SVO '85-'86
- Ranchero '68-'84
- Aerostar, Probe, Bronco II/Ranger to '89
Hudson - all '48-'56
Lincoln - all '70-'72; '80-'89
Mazda - RX7 Turbo, 626, 929, MX6 '86-'89
Mercury - all full size cars '52-'54; '61-'72; '79-'85
- Cougar '67-'79
Mopar '73-up "A" body
Plymouth - all full size cars '37-'89
- Barracuda '70-'74
- Duster, Valiant, Volare '73-'80
Pontiac - Tempest, LeMans '61-'63
Studebaker - all '51-'66
Toyota Crown, Hilux P.U.Toyota - 2WD P.U. '69-'89
- Supra Turbo '86-'89
Volvo 122, 1800
5 on 115mm (4.527")
Buick - Century, Electra, LeSabre, Regal, Riviera (some) '83-'89
Cadillac - Allante, most others '84-'89
Chevrolet - Celebrity '85-'89
Oldsmobile - Regency, Ciera, Cutlass, Delta 88 '84-'89
Pontiac - 6000 '83-'89
- Bonneville, Grand Am '86-'89
5 on 120mm (4.72")
BMW 2500, 2800, 3.0, 520, 530, 630, 730
BMW - all 5 bolt to '89
5 on 4-3/4 (120.6 mm)
Buick - Regal, Century, Special (most mid-size) '64-'80's
Chevy van
Chevrolet - all (exc. as noted elsewhere) '49-'89
Corvette all
Corvair '65-'69 5-bolt
GM compact and midsize
Oldsmobile - 442, Cutlass, F-85, Toronado
(most mid-size) '60's-'80's
Pontiac - GTO, LeMans, Firebird, Grand Prix
(mid size) '64-'80's
5 on 5 (127 mm)
Austin-Healy 3000
Buick LeSabre, Centurion, Riviera, Electra
Buick - Electra, LeSabre, Riviera, (most full-size) '35-'87
Cadillac - DeVille, Fleetwood '38-'89
- SeVille '77-'79
Chevrolet 3/4 ton vans
Chevrolet - Bel Air, Biscayne, Impala, Caprice, Kingswood '71-'76
- above w/HD package wagons '77-'89
- Blazer 2WD '71-'83
Chrysler - Imperial '67-'71
Ford, LTD '73-'75
Ford - T-Bird '72-'76
- Galaxie, LTD, Custom '73-'78
Lincoln - all (exc Versailles) '60-'67; '73-'79
Mercury - all '55-'60
- Cougar, XR7 '73-'77Oldsmobile - all full size RWD '40-'87
Packard - all '51-'55
Pontiac - all full size RWD '40-'86
Rover
5 on 130mm (5.118")
Porsche - 911, 912, 944 to '89
5 on 5-1/2 (139.7 mm)
AMC - Jeep (5 bolt) '42-'89
Chrysler - 8 cyl. & wagon '46-'55
- Imperial '54-'66
Ford 2 ton van
Ford Bronco, F100
Ford - all '28-'48
- full size P.U., van, Bronco '49-'89
International Scout, Travelall
Lincoln - all '52-'60
Mercury - all '39-'51
Suzuki - Samurai '86-'89
4 Bolt Wheels
4 on 3-3/4 (95.2 mm)
Austin Marina
Triumph Spitfire, TR7
Lotus
4 on 98mm (3.858")
Alfa Romeo Alfetta
FIAT
Lancia
4 on 100mm (3.93")
Acura - Integra to '89
Audi - most models to '89
Audi Fox
BMW 1600, 2002
BMW - 2002, 300-series to '89
Chevy - Chevette '76-'87
- Spectrum, Nova '80-'89
Dodge - Omni, Rampage, Aries, 024 '79-'85
- Charger, Daytona (FWD) '82-'89
Honda - all (except '76-'80 Accord, Civic) to '89Isuzu - Impulse, I-Mark to '89
Nissan - Pulsar, Sentra '87-'89
Opel Kadett
Plymouth - Horizon, TC3, Reliant, Voyager '78-'89
Renault - all to '89
Toyota - Celica, MR2, Tercel '86-'89
VW - Dasher, Fox, Jetta, Rabbit, Scirocco to '89
4 on 4 (101.6 mm)
Austin-Healey Sprite
Crosley - all '39-'52
MG Midget
Jensen Healey
Opel Manta, Kadette, GT
GM L-body
Buick Skyhawk '75-'81
Chevrolet Vega, Monza '71-'81
Pontiac Sunbird, Astre '76-'81
Oldsmobile Starfire '75-'81
4 on 4-1/4 (108 mm)
Alfa Romeo (exc. Alfetta)
Ford - Fairmont '78-'86
- Mustang 4-bolt patterns '74-'93
- T-Bird '80-'88
- Pinto '71-'80
- Fiesta '78-'85
- Escort all (RWD and FWD)
- Cortina all
- Taurus, Tempo, EXP to '89
- German-built Capri I, II, III '69-'8?
Mercury - Capri '71-'88
- Cougar '79-'88
- Merkur, Topaz, Lynx '80-'89
- Zephyr '78-'86
Plymouth Cricket
Porsche - 924 '77-'84
Sunbeam - Tiger, Alpine '65-'70
4 on 110mm (4.33")
Mazda - RX2, RX3, RX4, GLC, 626, P.U. '71-'82
- RX7 to '85
4 on 4-1/2 (114.3 mm)
Acura - Legend '86-'89Buick - Special '61-'63
Chevrolet
Corvair all 4-bolt
Chevy II all 4-bolt
Sprint '85-'87
Nova ('61-'70)
Datsun/Nissan - most models to '89
Dodge Colt '79-'88
Dodge Colt (early)
Ford
Mustang all '65-'68 4-bolt
Falcon, Maverick, Granada all 4-bolt
Mazda - 626, RX7 '83-'87 ????
MGA, MGB, MGC
Olds - F-85 '61-'63
Plymouth - Arrow, Sapporo '79-'88
SAAB all ???
SAAB - 900 to '87
Toyota - most exc. MR2 and P.U. to '89
Triumph TR 1..6
4 on 110mm (4.724")
Honda
4 on 130mm (5.11")
Porsche - 914 '71-'82
VW Beetle, 411, 412, 1500 Sedan, Transporter/Vanagon