Primarily Petroliana Shop Talk Forums Shop Talk Petroliana Forums General Petroliana Discussion Tokheim 39 upper trim gasket?

Looking for info on what type of flat gasket material was used on the upper trim? Neoprene or some sort of sponge rubber?
Thickness of that material? and/or any vendors that sell just the pre-cut gasket without buying the stainless trim itself.

Can see a hard gasket material residue left on my 39 lid, but not enough to gauge any thickness.