I was thinking you had a 1500 trike. Sorry. The aux tank should be the same kit for either a 1500 or 1800... maybe RS will straighten this out this week. Their customer support has been top notch since I bought mine. I would like them to comment on a locking gas cap. That cap of mine sits on my left rear fender and looks inviting when gas prices are high hehe I did find someone has loosened it once when parking in a motel lot and not sure if they siphoned any gas...