Original seals are made out of neoprene. I have found many uses on vintage and new vehicles of similar-thickness neoprene, and decided to buy myself a general purpose roll for very cheap.
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
Neoprene Sponge Foam Rubber Sheet Roll - 15in x 60in (1/4in Thick) $17
I crudely cut out my own A/C/heater box gaskets for my truck last year(uncompleted project). They should seal fine but I'd like to admit the truck is not currently in service.
Many different kinds of roof-marker-lamps use neoprene gaskets when new(Ford). I understand many use rubber pads, but many use neoprene too. So I'm gonna try that when I install my roof lamps.
Taillight lenses use neoprene gaskets. As do they use neoprene on my 1997 Honda, which I've made new gaskets for with my roll I bought.
I've used it for cushion for slamming house doors.
It's a cheap roll that goes a long way, is what I'm sayin'.