BioMax
+1y
Cory- I think any of the three (RX-7, Supra and 300ZX) rear irs would work, but all of them will need to be modified in some way to do what you want them to.
Seth- The Jag stuff is not my cup o' tea, but they work. If you want to build something out of the third-member and use different knuckles, then you could end up with something worth braging about. The cost for that would be quite minimal too sense you can do most of your own work.