!963 GMC Suburban Custom model seat rebuild

[62CustomBurb]

I've had my '63 GMC Burb for just over a year now, and have spent time getting it road-worthy and addressing all of the many leaks (oil pan, PS, Pow-R-Flo tranny etc.). Now I am using the winter downtime to address the condition of the e=seats (all 3 originals present). The seats had the original custom Silver Fawn upholstery under a later recovering. I have removed both sets, and am sending the originals to SMS for reproduction. The front seats are the spring type with cut and folded foam, and I expect I can use a rebuild kit for that. I was surprised to find that the middle and rear seats were both full foam, with shaped foam cushions for seat and back. Any sources for these? I expect if I must they can serve as models for sculpting new ones from thick foam. Ideas and input appreciated!

Brad