I finally found a decent set of moderately-priced seatcovers for my '77 X, from a California seller on eBay with the unlikely name of Iggee (link below). Under $200 for the pair, they fit very nicely, look good, and seem to be made of decent quality material.
http://stores.ebay.com/Iggee-Custom-Seat-Covers
Took about 3 weeks (and one gentle reminder email) for them to make and ship the covers.
Usual disclaimer, I have no affiliation with these folks, just a happy new customer.
http://stores.ebay.com/Iggee-Custom-Seat-Covers
Took about 3 weeks (and one gentle reminder email) for them to make and ship the covers.
Usual disclaimer, I have no affiliation with these folks, just a happy new customer.