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That’s what I see from the pictures. I have longtubes on a 6.0 so mines different but on yours it looks like one is smaller than the other.It's the donut shaped gasket, but everywhere I had seen an example, it was referred to as a flange gasket. In the link you sent, the right and left are different. Is that correct?
GM# 15035747 RHD EXHAUST SEAL DOUGHNUT $18.56
GM# 15077362 LHD EXHAUST SEAL RING $16.70
Do you know if there is a gasket that connects from Y pipe to the muffler pipe? I’m dealing with a 2003 avalanche z71 with 5.3. These gaskets seem to match up with the manifold sideGM# 15035747 RHD EXHAUST SEAL DOUGHNUT $18.56
GM# 15077362 LHD EXHAUST SEAL RING $16.70