Foam quality... what the numbers mean?
I am in the process of putting the interior back together on my 49 Ford coupe and need some seat advise. I started taking the covers off what I thought were decent original seats and found some problems. Apparently the seats have been out in the weather at some point in their long life, or at least the front seat backs have been. the rear seat and the front seat bottom seem to be fine, but the front seat backs are trashed. The springs are rusted to the point that they are not repairable. I'm thinking of junking everythig except the main outer frames and rebuilding seat backs using a solid foam cushion instead of the original spring setup. I'm thinking if I mount a plywood panel to the seat frame flush with the back I can build off of that with foam to create the seat backs. This will also let me put some more shape to the seat than it originally had. Maybe this plan is complete crap? I'm hoping someone will tell me if it is. But if it's not, my bigest question is what quality of foam do I need for something like this? I don't want my seat backs to go "flat" 6 months after i get my car on the road. The places i've been looking at foam (online) have a numbering system that sell foam by. Living far away from any foam supply stores how do I know what number of foam to buy without being to see/feel some samples?????