Vacuum Suction Cup Level CompensatorsSuction Cup Level Compensator Mounting BracketsPart # 28500240 Part No. A in. (mm) B in. (mm) C in. (mm) Description Weight lb (grams) 28500240 0.64 (16.2) 1.00 (25.4) 4.00 (102) Mounting Bracket for SLSA-2 Alum – 1 x 4 x 0.64 0.132 (60)