Help Finding F40 Seatback Rake Adjuster

I’m in desperate need of a driver’s side seatback adjuster for a US F40. It looks like an upholsterer previously reassembled both seats with the inside and outside brackets misaligned. I was able to correct the passenger seat, but the gear reduction in the outside drivers bracket is badly broken.

The parts manual shows only the plastic knob or an entire seat. I’m considering installing one piece Euro style seat without the hokey “madmouse” belts, but I’d really prefer to get the original seat fixed.

Any ideas where to might get a seatback rake adjuster without buying the whole driver’s side seat? Anyone have a driver’s side US factory seat they’d be willing to sell? Condition’s irrelevant as long as the rake adjuster works.

Thanks so much for any help.

Mark