If its a first series 6 lug you could use 54 Chev passenger hubs. I'm pretty sure. If its a 55 second series, a 55 chev passenger hub might work.
Try some of the older Chevrolet and GMC aftermarket suppliers. There are some that sell used 54 Chev passenger hubs.
Note the 54 Chev passenger hub has a large diameter center. Might be hard to match for the rear.
>
>>>>
>>>Hey there,
>>>
>>>I just bought a 55 GMC and would like to convert the 6 bolt hubs to a 5 bolt
>>>while keeping the stock front leaf spring setup. (The rear is easy...whole
>>>new rearend)
>>> Without a big bug conversion kit.
>
>
>Why not just put a set of 6 bolt rims from a Nissan or Toyota pickup
>on? Some real nice stuff is available at reasonable prices.
>>>
>>>Also, what is a good fitting rad to use with a Chevy 350 engine in it? >>>
>>>Thanks,
>>>Reg
>>>
>>>
>>HEY THERE I GOT A 56 CHEV PICKUP. i used a caprice diff in the rear
>>and got a rotor conversion for the front . i used calipers off caprice
>> and also the brake pedal booster and master . the caprice was an
>>85.you will also have to change the plastic resovoir with one from a
>>full size chev pick up . the caprice resovoir sits on an angle . hope
>>this was helpfull.