Where can I pick Up rear seat foam??

[free70coupe]

I got my 1970 mustang for free from my uncle who had it in his barn for 12 years... well the mice decided to make a nest under the rear seat. so i need to find some place to Purchase the Foam or "cushion" for the rear seat. Also where would be the best place to purchase my interior Kit for carpet and seat covers?

Thanks,
Nick