I believe that the 3/4 & 1 ton (36xx&38xx) Chevys and (15x,25x) GMCs use the same front brakes. Following is taken from the 1954 GMC Master Parts Book. I don't have a Chevy parts book.

There are 5 springs in the front brakes. One of index 4.0322, two of index 4.0325 and two of index 4.0330.

4.0322 shows part number 1416760 used on front and rear of 1953-54 3/4 and 1 ton trucks.

4.0325 shows part number 3696704 (including pin) used on front and rear of 1/2, 3/4 and 1 ton trucks.

4.0330 shows part number 3694822 used on front and rear of 1953-54 3/4 and 1 ton trucks.
Attachments
clipboard01.jpg (52.02 KB, 89 downloads)
Clipboard02.jpg (54.16 KB, 87 downloads)

'57 GMC 102, Original 347 V8, HydraMatic, 3.08 rear gear, added A/C, disk front brakes, HEI, AFB carb, '98 Honda Black Currant paint. T-boned and totaled 10/12
'52 GMC 152 Stake Bed, Original 228, SM420, added A/C, HEI, disk front brakes, '67 Chev 3.55 rear gear. Gets used as a real truck.