If I bought a I beam that had a 46" dimension between the king pin centerlines, how much extra width would the spindles and hubs add? I'm building my first fenderless car and all of a sudden these things seem to matter. The rear I'm using is a Jag, 61" wide, that will need to be narrowed. The car is a 30 Chevy which is very close to a 32 Ford, except the rear of the body is a little wider.