Looking for a large watch case gasket - can you help?

Hi all.
Can anyone let me know if they have an idea where I might be able to pick up a watch case gasket close to these dimensions, see pics. The gasket in the photos has been stretched and compressed over the years. I can stretch it out a little if needed. Not for waterproofing but really for dust-proofing. Given its age it will be going nowhere near water.

Hoping you might have some ideas.

Thanks in advance.

OD 35mm
ID 30mm
thick 1.5mm

I had this issue with a Bulova devil diver- thick round gasket that was NLA everywhere. Went to a local hardware store with the watch and tried o-rings until I found one that was actually a perfect fit.
I should buy a mess of those .20c o-rings and put them on eBay with a little vial of silicone grease and sell them for $19.95 to watch people…they’ll buy anything.

Try Labanda?

You can buy small refill packs of 5 for $4.50. Just need to select the size.

https://www.labanda.com.au/watch-spare-parts/seals/case-seals/flat