swappin rear ends

No 9" housing from a factory car will swap into the SN95 chassis.

However, there are companies out there that are making custom housings for 9" pumpkins. Check out 9inFactory's 9FFOX part, for instance:

http://www.9inchfactory.com/webfiles/Mustang Flyer.pdf

But the question I have is: What's wrong with the 8.8" in your car now? It's plenty strong stock and can be upgraded to 31-spline axles for even better durability.