I bought 2 2.5" copper gaskets (
http://www.summitracing.com/parts/SCE-4200/) for the DP->MP connections. They stick out a little at the bolt corners but don't leak. I had previously used the ones that came with PLM DPs but they were leaking.
The MP->Axle back connection uses a donut gasket. I had to special order it from my dealer.
As long as your exhaust is setup like the stock exhaust those are the 3 gaskets.