API AC108COMBOP4-LDTT250P Clamps & Topper Tape&reg; for Mounting Truck Caps on Ford F Series Super Duty (Set of 4) Set of 4 clamps & 1 roll of Topper Tape designed to mount truck caps on Ford F Series Super Duty pi Constructed of tempered aluminum with a mill finish Complete installation guide AC108: A = 1 3/4" B = 3 1/4" C = 0" - 7/8" (See technical drawing above) AC1031: A = 1" B = 2 1/4" C = 0" - 7/8" (See technical drawing above)