Bolted right up and fit great. More gas. And no more rusty gas. Stock 2009 Tomos ST seat took some minor modifications to fit with the tank, peeled the upholstery back and used a saw to chop about 3 inches off the nose of the plastic seat pan, then stuffed the foam back under the upholstery and it looks and fits awesome. Probably gonna have to delete your oil tank and seat compartment to be able to fit the rear bracket on the seatpost. Excellent product 10/10 would buy again.