The overall outside width dimension of the Dexter DX7.5 -N-Go Brake Actuator - Drum Brakes - 2inch Ball - Zinc Plated - 7,500 lbs Item # 099-175-00 that you referenced is 3-1/2 inches. It normally fits onto a 3 inch wide frame channel and has a metal thickness of 1/4 inch. view full answer...