I have seen the seats come off during races many times over the years. It happened to me 2 months ago during a qualifier and then it happened to a friend the next month. He said I should make something for our trikes so this doesnt happen again, and thats exactly what I did. Now available for the 83'-85' ATC 200X and 85'/86' 250R in the 3WW store. I will have the 350X plates ready next week. Billet seat pin system securely holds your seat/fender in place. This is a must have for racing and hard riding.