Lots of different seat covers available on Fleabay from $40 up.
I fitted one on Sanji before I bought the Russell.
You will need a good quality electric or air powered staple gun.
Trust me, the manual guns just don't cut the mustard.
Oh, and take your time and do it right. If yer rushed it will hurt yer butt!
I ended up with a crease in the liner and after 4000 miles it finally irritated me enough to redo it and do it right!