felpro makes a rear axle flange gasket.
#RDS13410
available thru advance auto .
this could be the right gasket. i dont know. mine were re-useable.
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i dont know that they all work on commission. seems like i wouldn't wait in line so long if they were
regardless, you have to know what to ask for and who to talk to. if you dont have both their exact nomenclature, and the right person, you're screwed. unless you have a part # they can type in their computer.

carquest example:
ME: i need a 2" GM exhaust flange. #F48 in your catalyst accessories book.
HIM: flange gasket?
ME: no, metal 2 bolt flange. holds the pipe to the manifold.
HIM: (poised at computer keyboard) what kind of car?
ME: 1968 firebird 4.1 4bbl. should be the same for, say, an 87 olds cutlass. standard GM 2 bolt flange for 2" pipe.
HIM: confused, sighs, finds a book, thumbs thru, finds a different book, thumbs thru
ME: it's in the back of that first book
HIM: there's no listing on a donut gasket.
ME: there is no gasket. it is a metal flange.
HIM: it doesn't show a flange gasket
ME: you need to look in the back of that first book with catalyst accessories. it has pictures and descriptions of all the flange types.
HIM: what kind of car?
------- now add 10 min of 'who's on first' by Abbott and Costello.

ADD: 1 knowledgeable counter person.

HER: you need to look in the back of the catalyst accessories book. it has pictures and descriptions of all that stuff.
HIM: thumbs thru wrong book. "what year firebird?"
HER: slap. shoves correct book at him, turns to flange pages.

ME: less $11, some degree of sanity, and 30 wasted minutes, going home with a pair of 2", 2 bolt, GM style exhaust flanges.... and a headache. F48 in the book, 578475 in the computer. both #'s on the box.

please feel free to laugh at my pain.

there actually was alot more to this.... 578474 flange gasket? no, that's an F43, see the F? that's for flange. and it's a metal flange, not a gasket. and that's for 2.25" pipe. you list the wrong one. i need one for 2". it's in the catalyst accessories book, in the back pages....... there are pictures and descriptions. i dont know your inventory #. the book # is F48....... sir, F is for a donut gasket....