Need suggestions for mast chocks

[Newport41]

I'm in Rarotonga and have limited time and facilities. Our mast chocks (partner chocks) need replacement. One is falling apart the other now too small after 5000nm at sea. Does anyone have a suggestion of what I could use to replace them. They need to be firm rubber, at least half an inch thick, and about 1'' x 4''. There is a building supply store, auto parts store, and everything else you'd expect to find in a town of around 10,000 people. Much thanks for everyone's suggestions.

[Tempest]

Some commercial chair rails..are made of rubber and come in a variety of sizes

rubber Wire protectors..?

[sailor50]

Why don't you just use a car tire until you can get the "corrrect fitting - just what is a correct mast partner fitting? I've seen rags, polysulfides, 5200, a mess of silicone!

Sew a mast boot out of a piece of sailcloth.