That seat looks like it's for the early K100 ('85 or '86) with the hand holds on the seat instead of the tail cowl.
A photo of the motorcycle it came from is attached. According Grendell's original post concerning this moto, he's been under the impression that it's an '89. Judging from the tank mount's it could be. Maybe the previous owner put an earlier cowl on it, or it was assembled in a cusp year for those parts.
Yes it is. Can you pm me your shipping address.