Sold my K100, leftover seat.  It had a minor stitching come lose on the side, so I had it fixed, professionally.  Asking $200 plus shipping.  Rip was on the front right, so you can see the repair was perfect.  Comes with a backrest.  I had it on my 85 K100 RT, but used the 1986+ tail piece.  I have a spare 1985 style tail piece as well now??