I am attempting to put a Mustang seat on the 15 R3T now, in fact a call to Mustang is about to happen. I bought one and it came on Saturday, I tried to fit it but no joy. It appears that the 2 side mount screw brackets are not installed correctly, line one up and the other side is a 1/2" off. The brackets are pop riveted to the plastic? seat pan, I figure I can remove them and slot the brackets and re rivet BUT not before talking to Mustang. The quality looks good and it does lower the riding position, just need to sort the fit.