I've got the same problem...just started on my '51 and as far as I can tell there are 5 different sizes that were used. The largest is for the fenders and smallest size was on the back of the ignition switch. I ordered a set of 4 screw drivers from Classic Industries today ($19.95) and a Matco Tools Distributor has 3 different sized socket drivers on order for me. I'm going to figure out all of the available sizes etc. and will advise later. Now I need to find out where I can buy extra clutch bolts because I'm sure I'll break a few.