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It's good practice to identify the year/make/model/engine of a particular part you are looking for.
In any case the gasket you are probably looking for is available on Rockauto or just about any auto parts store.
Here's the link for the "Oil Filter Gasket" for a 1970 Oldsmobile 455
. 1970 Oil Filter Gasket
I had to make one when I took mine off my TA. Used an exacto knike to cut one out of a sheet of material. I bought a set of punches at a swap, it’s an easy gasket to make if you can’t find it. Inline tube may have one, Those guys are Olds too.