Catalytic Converter on 2004 Cadillac SRX

Is there a unit that's compatible for the GM part? I priced both parts at dealer left and right side for my vehicle and they cost almost $500 a piece.

Asked by for the 2004 Cadillac SRX
GM had/has recall for their Cat Converters, did you look in that? I have sent a lot of cars to the dealer for free CATs, they fail often on late model GM. I do Emissions work in CA.