1977 308 GTB 21819 Door Panel Arm-Rest Restoration

Hi All,

I'm reupholstering my GTB door panels. I have removed the old vinyl and foam from the arm-rests and discovered there is a foam cushion inset to the fiberglass armrest. The DS rest is wasted (compressed and out of shape) so I want to create new ones with some sort of equivalent upholstery structural foam. Does anyone have an idea of what to use for this? foam insert shown on the right of these two pics. I was thinking of using some expanding foam that I could sand onto shape but I don't think it will hold up to the task of regular use. The original foam seems pretty rubbery and tough, so it will give and not crush like expanding foam would.

Hopefully someone has ventured down this path in one of these cars or another car and knows some industry specific materials. I looked on McMaster and I don't see anything that would work unless I get some rigid foam, which wouldn't fill the arm-rest cavity. Maybe a (very) high-density memory foam?

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