Re: 5 lug?
Up front, drop spindles or spindles from any 71-87 1/2 ton truck. Spindles, new ball joints to fit you a-arms and an outer tie rod to fit your spindles.
Out back.....66 will have trailing arms which you will need to weld the mounts onto any new axle housing you get other than the 71/72 coils sprung 12 bolts ( good luck finding one of those!)
Your easiest option is to either purchase new axles in the 5 lug pattern OR pull your axles and take them to a race machine shop and have them re-drilled( take a 5 lug drum with you for surety)
Good luck!
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