1. Yes, that will work. Actually, your center bolt looks pretty good. When I pulled mine to insert some shims, it looked like a corkscrew. Is your center bolt a 5/16" or 3/8"? MJ leaf springs came with either. Mine looked so bad I did some checking. In 1993 or so Mopar abolished the smaller 5/16" bolt and started using the larger 3/8" bolt because of failures (unpublished dealer-only bulletin). So while I had mine apart, I reamed the hole out a bit and used 3/8" center bolts. Might last longer. :eek:
2. Don't know. I have D-clamps with a 3/8" rivet through the leafs on mine.
3. NAPA carries these, at least they did last year. Or you can get them from a spring mfg. shop.