Re: Scheel/A.S.S seats. Original RS?
Escort Ghia mounts would probably be the easiest to source and are same as RS/ Scheel. I'll keep an eye out on this side of the country (WA) and let you know if any come up.
The ply board is an interesting fix for the sag, they all do it, I once pitted mine with a phone book under there, lol the examiner was none the wiser.
GT Cortina Project "The Ugly Duckling"