Hi dep . . .
There is a site that specializes in the military applications of GMCs found in CCKW and DUKW vehicles:
The GMC CCKW Page The parts interchange between 248, 270 and 302 have been discussed on this site and over at H.A.M.B. Patrick Dykes' site has some info and aftermarket parts for GMC:
Patrick's Jummy parts show up on Ebay now and again. But I am not sure about the differences between civilian and military GMCs so interchange would need to be established.
regards,
Keith
