I spent some time this morning sorting through boxes of random motorcycle rear shocks. Apparently I have collected about a dozen pair of shocks off different bikes, not counting the shocks still mounted on parts bikes. I'm looking for something a little bit taller than stock for the rear, to go with the lower than stock front ride height. I may need to adjust setups once I get the engine in it, but so far so good.
It looks a bit high in the rear, but it is sitting on the center stand, and there is no weight on the suspension. Note, that is also a spare junker 2.25x17 tire. The new rear tire should be arriving next week, and is a bigger 2.75x17 size.
I used a set of Trail 55 rear shock towers (the aluminum parts.) These slide over the normal shock mounts, and attached with three small bolts.
Rear shocks are off a Yamaha GT80, I think. I made new bushings using 5/8" heater hose. Somehow, everything fit. The hose would just squeeze into the shock eyelets, and over the shock stud.
Also, note the location of the footpegs, attached to the swingarm. I welded a nut to the backside of a washer, then welded the washer to the swingarm tube (that runs from side to side. Now I just need to figure out some handlebars.