2G o2/downpipe gasket

[Type1DSMr]

Ok so I was lied to about my exhaust from the previous owner about the size of 3" from o2 back. Well I took off the the o2 from the downpipe because the gasket was shot and notice that the o2 is a 2.5 and the downpipe is 2.75 but was using a 3 gasket cut to fit. Now the end of the dp is a 3 so my question what gasket do I need to fit. I'll show pictures of the parts. First pic shows old gasket on a new 3" gasket.

 

[Type1DSMr]

Does anybody know which gasket will work? If not I'll just order a 2.75 and a 3, trim to fit like old gasket if have to.

 

[95_gsx_2g]

I use a ported 1g 02 housing to a 3 inch turbo back including the downpipe connection. I also got a 3 inch gasket that's layered steel. I had to trim the stud holes just a bit but the actual inner size difference on mine was off a bit too just like in your pics. It seals fine and doesn't leak at all though!