rear shocks
 

How does the rear shock mount into the bottom hole? Is it just a bolt that screws onto the bottom bracket or is it one of the bolts with a nut built onto it as a spacer (like the 73 and up)? Anyone know what I mean? Thanks.

???
Leaf or coil?

The leaf has a bracket that has two side plates. Both plates have a 1/2 inch(I think) hole and the shock sits between the plates. The shock has a rubber bushing in it and the bolt goes through one plate, the busing and the second plate. There is no shoulder on the bolt and mine don't have a metal spacer inside the rubber bushing.

I don't know about coils.

Hope this helps

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Scrub
70 GMC 1,000,000 + miles
72 K-20 project, 456 Dana60 front, Corp14 rear w/locker, 265R19.5 tires 20-ply. Warn 12k winches both ends, Cross-over steering with raised tie-rod, Powerbox steering, 4500 watt 120-AC power, Air, Hydraulic aux power, 4 inch lift, 5000 lb air-bags both ends.

Sorry its a coil setup.