I just bought a Clarke 5 gallon tank for my 1998 XR600R, not real happy with fit of tank compared to my stock one. I have gaps between tank and seat and side plates. Purely cosmetic. I called Clarke and was told there is no adjustment. How it is once you bolt the tank in place is the way it will stay. I verified seat is slid into place correctly, both front and bottom. I think it needs to be back 1/2 inch and it would be ok. Anyone have similar problem and fix?