Need help finding a replacement vacuum oven gasket

I recently came across a precision scientific model 19 vacuum oven for a steal. Unfortunately it’s missing the gasket. The seller is going to reimburse me on the gasket as he advertised it was in working condition and that no parts were missing. I’ve been searching and reaching out to different distributors and I emailed the actual company. The gasket I need is 8x8” btw

This is the same Kind oven I purchased. When I enter the catalog number or model number a completely different oven comes up instead