I put a set of Coverking "ballistic nylon" seat covers on the front seats of my '01 ST. I did this for 2 reasons. 1) Because my leather driver's seat bottom was in bad shape and I did not want to do further damage to the foam. 2) My passenger seat was in good shape, but I often have my dog in the truck with me so I figured this would protect the passenger seat. I typically leave the rear seats in the down position, so I don't worry about the dogs messing up the rear seats. I found the Coverking covers to be of okay quality and to fit pretty well for a universal product. I think they cost me around $68.
Some day I may decide to replace the foam and leather seat bottom on my driver's seat. I've bought/installed both leather and vinyl seat bottoms for Gen II's from theseatshop. They sell OE style replacements. They are excellent quality, look and fit like OE but are a bit pricey. Around $200 for a leather seat bottom (or top) and around $130 for vinyl. IIRC new bottom seat foam costs around $100. The people at theseatshop were extremely helpful, as are their installation videos. All universal-fit seat cover's are cheap, don't fit all that well, don't hold up that well and look like obvious covers. Better than nothing, but they wont stand up to the long haul.
