Point-Seven-five
Life time member
Number of posts : 4214
+1 on the bench seat not being that desirable. Add to that the fact that it is not interchangeable on newer bikes and you have an item that will take patience to sell.
I would probably list it here and a few other BMW enthusiast forums. Possibly put it up for auction with a $50 starting bid. I have seen a fair number of those seats on eBay mostly offered by breakers who are asking top dollar. At $50 yours will be very attractive. Because of the high shipping cost unless/even if you make a custom box it's hard to get a lot for seats.
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Present: 1991 K100RS "Moby Brick Too"
Past:
1994 K75RT "Ilsa, She Wolf of the SS"
1988 K100RS SE "Special Ed"
1994 K75S "Cheetos"
1992 K100RS "Moby Brick" R.I.P.
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175