"Dual" Locking Height Extension MountT10-513 — 6 in. (15.2 cm) ExtensionOverviewPartsBuy"Dual" Locking Height Extension MountT10-513 — 6 in. (15.2 cm) ExtensionParts10-324Spring Clip Locking$10.9810-325Plug Insert 7/8 in. (22.2 mm)$2.98