If you can get Ricaro Sport seats out of an older BMW they have a flat floor pan.
I added a 2 inch bracket to the rear of the seats because of the drop off in the pan toward the rear.
The BMW's flat tracks made it easier to make brackets to adjust to the uneven floor.
2 inches in the back, and 1 inch under each front inner track and they went in pretty nice.
I ordered these from a company on Ebay and had them cover the seats in two tone.
They were right at $750 delivered, and took about a week and a half to ship after the order.
They adjust up and down, forward and back, tilt angle, thigh support and the headrests adjust forward, back and up and down.
The passenger seat will lay all the way down almost flat, and when you lift the release to let someone in the back seat they move forward about 6 inches and return to the original position when you put the back into place again. (it makes WAY more room to get into the rear seat)