Does anyone have the newer style seat pan bottoms 4 sale. I had the old style ones (78) in my car but they look like swiss cheese.

I already purchased the cushions for the seats. They are the new style. So if the bottoms would attach to the rest of the seat with no problem. I figure I'll just get the new style seat pan. Does anyone see any issues with doing this.
Also, can we get new springs or metal for the inside of the seats? Mine are rusted pretty bad.