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There is no chance you'll find gaskets for an almost 60 year old wall furnace. You're only shot would be to make the gaskets yourself. The best product for the job is a fire proof "blanket" material called Koawool. It's a wool like non-woven "fabric". It's available at any plumbing supply house and comes in various sizes and thicknesses. The 1" wide X 1/4" thick size would probably be best for your purposes. You can split the thickness if you need something thinner