55-57 cars and trucks used the same shoes front & rear. 2" in front and 1.75" rear. The later cars and trucks used a wider shoe in the rear but the backing plate was different to accomodate it. The front & rear drums were the same width on 55-58 cars and 55-59 trucks. The only difference being 5 lug vs 6 lug. Forget the self adjusters.
Fred

Last edited by rfs56trk; 03/14/2012 5:16 PM.

1956 3100 Pickup/Red/350/3sp OD/PS/Disc Brakes
1957 Bel Air Sport Coupe/Red/355/TH350/PS/Disc Brakes
2017 Silverado LT Single Cab SB/Black/5.3/6 Speed Trans
1947 Willys CJ2A w/F-Head engine