I once made an aluminum plate that I mounted behind my license plate. It had a tab that stuck out from the side of the license plate were I put a parking sticker. When I didn't need the sticker anymore, I just pulled the extra plate off.
On Pa. bikes they are suppose to be on the left fork but I don't think they are real strict about it. I had a custom bike that I mouted a plate in front of the left foot peg and never had any problems. I just don't want a sticker on a body panel messing it up. I guess I'll see on Sat. where we can put it.
Well, got off work in time to get the Spyder inspected today. They put the sticker on the swingarm/ belt cover, said anywhere on the left side would be ok. Works for me, can hardly see it unless your looking for it.