Need components not entire seat

[Drewhenry]

Dealer has not been very helpful(are they ever). My lumbar adjustment broke when I was twisting to shift my weight(I am 6'3" and 278--not gargantuan). No problems getting to the mechanisms--cheap plastic--I should make new ones out of 7075T73 Al, but for now would like to buy the mechanism without paying for an entire seat. Anybody know where I can get such items.

I think now would be a good time to install seat heaters and leather seat covers . Thanks