By - axe81
After taking the seat covers off my 99, I don't the the foam is that specific. I would just measure it and get foam the same sized.
I've gotten good things from Bowen Foam and Fabric. They have year specific manuals and may also know the dimensions that you need. Most of their customers are reupholstery shops.
When mine went I got used ones from the junk yard, get a passenger side cause they are usually less worn, but they are the same as the drivers side.