55-57 gmc brakes?

[spitfire_er]

i keep hearing how hard brake parts are for these trucks and have yet to find a definate source for gm specific parts.

i have a 55 100 with v8 and hydra-matic. the truck came with a spicer 45 in the box and nothing attached. i now have another spicer 45 (original is junk) or i have a front and rear axle out of a 56 chevy. am i better off one way or the other. or if i could get a brake kit for the gmc stuff that would be cool too but im not sure where to get them.
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