Figured I'd give you guys a shot before putting the pair up on eBay. Just recovered my front seats with brand new leather (M3/convertible pattern), so I don't need them anymore. Don't think they're factory, but they are extremely nice quality -- about an inch thick and they fit the contours of E30 sport seats perfectly, with slits through the skins for the seat release levers.
Perfect condition -- no stains, rips or visible wear. Cover front and sides of seat -- top and bottom, plus about six inches over the back. Securing straps are all but invisible (you can only see the tan strap at the bottom of the seat in the back).
Also includes matching headrest skins that completely cover the headrest -- even underneath, thanks to a velcro seal on the seam between the posts. Headrest tilt function is retained.
Tan in color; great match for pearl beige or natur interiors. Very comfortable -- cool in summer and warm in winter (who needs seat heaters?).
$250 for the pair plus shipping (USPS priority mail -- cheap). I don't know how to post pictures here, but I do have a couple scanned I can e-mail to interested parties.