My 944 seat rails are completely seized.

Liquid Wrench may help. I would get a Dremel or drill with a wire brush on the runners first to remove as much surface rust as possible, then get a block of wood and a mallet and try to pound it free. (You would need to rig the seat rail lock mechanism so it is in the 'open' position'.) If that fails, you could unbolt the whole thing from the car and work on it on the bench. There you can try using CLR solution and heat.

Thanks Andy. I tried your suggestion but the seat is soo low to the floor that it is almost impossible to get to the right side of the seat to spray the liquid wrench. I will try and use a jack to move the seat and. Update how that goes.

Do you have a long straw or thin hose you can direct the liquid wrench under the seat?

I was able to use an old vacuum hose I had to get the rail to move and was finally able to remove the seat. Woohoo. Now I need new rails. Does anyone know where is can get a new set?

ebay, Craigslist and local car dismantlers will all carry 944 parts. In the Bay area, I know there are at least half a dozen Porsche dismantlers that would have them.