Help with 67 bench seat

[JM3176]

Hey guys! I am planning on redoing my stock bench seat in my 67 chevy pickup this winter and was looking for a little help. I was wondering where you guys buy your upholstery and foam for these seats. It seems just a little hard for me to find, especially since I want to go back to the stock look. Also my seat might be a little rare because it has springs in the bottom part of the bench and the foam on top of the springs. If anyone know anything about how to go about getting the right things I need, please let me know!

Thanks so much
James