See the picture and count the holes on your diffs inspection cover... both on yours and on the picture.. Note too the slots opposite each other on the gasket ... see how its laid out..
This is one of the gaskets used in various early 1970s with 10 bolt diff's... not every diff is the same and not everybody has the right diff.. so please check before ordering if at all possible.
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If your needing a Diff cover gasket - Look up "Gasket: Diff"
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If your needing a Axle C Clip.. - look up "Axle Clip Lock"