That’s because there are so many different ones. You’ll have to call with serial number for that. Recommend that you also measure the outside of the gasket to verify it’s correct.
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What you have is a spec line, aluminum box stainless front, solid single door reach in refrigerator. Problem is they list it under the SSR1, which is full stainless.
https://download.partstown.com/is-bin/intershop.static/WFS/Reedy-PartsTown-Site/-/en_US/manuals/DEL-SSR-SAR-SMR_iom.pdf
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Note the different profiles of gaskets and minor dimension differences. here.
delfield gaskets