If anyone has, say, a rear mattress cover with one side ruined but the
other side OK, in the striped brown pattern used in early 80s westies,
I'd like to buy it. I'm looking for any piece large enough to replace
the cloth part of the front seat, and would consider a replacement
front seat cover in good shape as well.

I have a set of seat covers that I removed from a set of uncomfortable
seats.
Ended up replacing seats with later ones with adjustable arms. Had
intended
put them on the new seats but abandoned that idea.
Evans
83.5 Westy
Charlton MA