You did a hell of a job on it, your right about the seat for the 90, it might fit, but you already fabbed up a great peice.Have not been out to the rally in about three years, too hot and crowded for me. We usally go up and ride on Saturday and do sixth street on Sat night. Maybe we can meet up. Went to the Harley dealership here and they had that Mustang backrest on clearance for $85. I seen the grasshopper but not for the 90. I love the bike but finding parts is tough. Ive made everything so far.