OK I think I figured out what these will and won't fit. I remembered that the rubber mats were sold in front and rear pairs and took a look at Tischer's web site to see how they broke down. It looks like the front mats will fit all body styles but RWD only. The rears will fit coupe only but both i and xi. I am not sure what the difference is in the front mats. If I were a betting man I would guess that the difference is the driver's side floormat/pan as the front diff is on the driver's side of the car, but I can't think of a way to confirm or deny that without having a live xi to look at. (so my good pass side front floor mat would work in any E9x with black floor mats? maybe?)
email sent to instigat0r but will let you know if he decides not to try 'em.