For the ones who don't know, mounting the master and booster on the firewall of one of these older cars/trucks are not as easy as bolting them on. Your late model cars have braces and double walls metal in some cases. The firewall on an older car will flex. Easy fix is to brace it or weld in a plate. Most guys just weld a plate on the outside of firewall and it's good to go. I did not want the plate to show so I went a different route and put the plate on the inside.