Balmar Belt Buddy w/Universal Adjustment Arm [UBB]Belt Buddy w Universal Adjustment Arm To utilize only the adjustment mechanism with an existing adjustment arm, purchase part number BBU. Caution: This approach sacrifices some travel in the existing adjustment arm so the BBU mechanism can be anchored to the arm. Make certain your alternator mounting does not need this travel before purchasing the BBU. This product may not be returned to the original point of purchase. Please contact the manufacturer