This fits ALL Pride Mobility Gogo Ultra X scooters built after May 2006. This does NOT fit the Gogo Ultra (without an "X") built before May 2006. Pride Gogo Ultra X model numbers are SC40X and SC44X. This also fits the Pride Mobility Gogo Elite Traveller but is not recommended for the Plus or the Sport. Pride Gogo Elite Traveller model numbers are SC40E and SC44E. The model number is located on a Pride label on the black part of the seat post or under the battery pack. Pride FDA Class II Medical Devices are designed to aid individuals with mobility impairments