Hello, I have tried everything I could think of and have not found a solution. The drivers seat in my 2000 park Avenue ultra is sitting 3-4 inches lower than the passenger seat. It is pinching a cable so the fuse had to be removed and the seats are non-moving right now. I can't find a seat on eBay for it and was wondering what other seats from similar cars might fit? I am open to any seat from any make brand or model if it fits and is in good condition and street legal. I would take a blue one, a manual one, anything! Any suggestions?

Is your current seat cloth or leather?
Does it have heated seat and or lumbar adjustment controls?

You can go here Car-Part.com--Used Auto Parts Market and enter your info, select Park Ave 1980 and up, then select Front Seat, and finally the option that fits the seat you have.
Then you can see which salvage yards near you may have one for sale.

I see a few listed in my area, from 75.00 up to 150.00 .

If the seat itself is still in good condition then you probably just want the electric-seat mechanism. Usually four bolts, upholstery hooks, and maybe a clip or somesuch for wires etc. hold the seat to the mech. Then you can pull a mech from any PA, LeSabre, Aurora, or Deville around the same year. Disclaimer: I'm 99.9% sure about 1998-2005 PA'* being compatible. The rest I'm about 65% sure of as those are from memory.

Good point about possibly not needing the whole seat, I seen some tracks with motors going from 40.00 to 55.00 in my area..