I can get you HO50 (don't know of an HO52) part numbers from the 1939-53 and 55.2-60 GMC Master Parts Books, but I don't have a book that covers 54-55.1
I'm pretty sure that a part number that was the same in 53 and 55.2 would be the same for 54. If you'll settle for that I'll look them up when you say go. Give me a list of the index numbers (like 2.120A) from the page attached and I'll see what I can do.
'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.
