I think you need Part’s-Town. This is Tech town. We just try to help techs solve problems. Parts-town sells parts.
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Are you certain you have a RS. Traulsen’s R series are a stainless in and out box. The same as their A series that has a aluminum interior. However, I do not see a “S”. Illinois Tool Works tends to protect their tech info and not fully share. The “R” series has been made into everything from a hot box to freezer. Multi zone cooling, pass thru, and glass or solid door. Because they spec made a lot of them, You’ll need to have the ML number and serial number to get the correct gasket.. Your RS is probably a spec model since the current common ones are RH. Often they are made for prisons or other specialty applications.  They also have a networked version for inventory control and monitoring.
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  I found out years ago that you need to confirm the style and dimensions of gaskets. I think I wound up with about 25% to 40% as wrong over the years depending on brand.. Traulsens mostly were good at it as they had accurate records. Other brands have lost information as they were bought and consolidated under a larger corporation.