The old material gets so brittle I don't think it can be stopped. Gumtwo's covers look good and are easy to install:
New gator teeth upholstery strips riveted to the seat pan to hold the new seat cover:
New skin stretched into place:
All that work just for this:
I wrapped the foam with saran wrap and folded it under the edge of the pan prior to stretching the cover into place. Helps keep the cover from snagging the foam and helps keep the foam from absorbing any water that might get through the stitching. Looks very good without much effort.