Just to update on this, the cat I've got will fit.
From the factory, it's basically two 2" pipes that are held together with a sleeve. Found that out when I undid it all the nuts and wiggled it along and the cat dropped down and it was a nightmare to put back together. Should have just fitted the new cat then and be done with it, but I need more beer and ibuprofen to be able to do that.
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