Universal Adjustment ArmFeatures: This part number is for the "Arm Only", It does not come with the Belt Buddy Adjustment Mechanism The Belt Buddy Mechanism which goes with the UAA is part number BB, grouped together the set is part number UBB The Belt Buddy Mechanism which goes with most any adjustment arm is part number BBU The UAA is 10.3" long and the adjustment slot provides up to 4.5" of travel. The adjustment slot is 0.53" wide This product may not be returned to the original point of purchase. Please contact the manufacturer directly with any issues or concerns.