Just The Driver Seat 300CD

[carock]

My 1985 300CD has a Palamino MBTex interior that is in acceptable shape except for the driver seat. The driver seat cushion, cover, and springs are shot. The driver's backrest springs and pad are badly worn. A few questions;

1. Is there any source where I can but just the driver's seat MBTex seat cover?
2. Is there a source, other than used on eBay, for coupe back rest pads?
3. I bought a used great condition bottom seat spring/cushion assembly that is in blue and just needs to be recovered. If you know of a source for a great used backrest spring/pad assembly then please let me know.

Thanks in advance!