Good morning Rust! Your rear differential looks like an Eaton HO52 to me. The rear cover gasket you need is a FELPRO RDS5088 Gasket . You can look them up online. Just search FELPRO RDS5088. This is the gasket I purchased and installed on my 1954 3604 which has the Eaton HO52 Rear differential. Here's a photo of mine...
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IMG_4792.jpg (39.18 KB, 160 downloads)
View of 1954 3600 Rear Differential

Last edited by Dusty53; 09/13/2023 12:57 PM. Reason: added detail

Ron - - Dusty53
1954 Chevy 3604
In the Gallery Forum
"You can't dance with the Devil and then wonder why you're still in Hell."
"They will forget what you've said, and they will forget what you have done but they will never forget the way you made them feel."