tsSVT
CEG'er
A Mark 8 ( 93 -98) , Cougar ( 94-97) , or ThunderChicken ( 94-97) would have a similar rear end ( but no posi ) for next to nothing at a junk yard. All of these vehicles had IRS and beefy aluminum control arms. Add a used limited slip for $50 and you are ready to go. Big brakes too if you wanted the whole setup.
Thanks for the clarification on that. I hadn't even thought about those models, I believe they have a smaller carrier than the Cobra does so they may be a better option anyway.