My '57 GMC 102 V8 had factory "Kudu Bars". I think that all 55.2 thru at least 57 GMC cabs had the cab studs for mounting the bars. I rummaged through the 55.2-60 GMC Master Parts Book and couldn't find the supports in either section 10 (Sheet Metal), 11 (Frame) or 23 (Body).
'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.
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