Looks to me like you have some JMB catless mids, and it appears you just need 3" exhaust donuts and exhaust studs since it looks like they torched them off. The donuts go where the pipe is expanded on the end.
Any idea where I can find the 3" donuts for the catless mids? The dealer said they'd reinstall once I was able to find the gaskets to make the seal.
I'm still trying to understand how these plug into the stock manifold (where the leak obviously was.) Does the donut go past the flared up piece of metal and sit against the bracket? You're certain it's a 3" donut?