Camaro exhaust manifolds collector connection

[Majourlittle]

I am not sure of a good source of the exhaust collectors for the ls3 exhaust manifolds for the downstream section of my exhaust. I have a donor suburban that I am using for my swap and was planning on using the collector parts from it but the suburban is a 3 bolt flange and the camaro a 2 bolt.

Without looking at the suburban stock exhaust, can I use the exhaust piping socket and get a pair of 2 bolt flanges off of ebay like the one in the link?
http://www.ebay.com/itm/Universal-FL...3d441d&vxp=mtr

Does anyone have a good source for a brand new pieces instead of me hacking one off of the old midpipe as I butchered it really good getting the engine free from the truck.

Part numbers from Oreillys?