At this point, the seats would have to be redone anyway, even if you were to find some in Saddle leather. As long as you have fragments of the original, it can be done by your upholsterer in any color you wish. The French seaming around the recessed panels in the pattern can be tricky and the transition area connecting the face panels should be vinyl as per factory. An intact seat back is a must, though, as those do not interchange with any other year or model. The lower seat panels are being reproduced by Bob Baker at
abcmoparts.com. Don't forget to order the trim covers for the seat release levers.