12-1/4" x 3-3/8" 8,000 lb Forward Self Adjusting Electric Brake Assembly – 4 Bolt Mount – Left Hand Part Number: BK-8KE-01 12-1/4" x 3-3/8" forward self-adjusting electric brake assembly for 8,000 lb trailer axles using a standard 4 bolt backing plate mount.-------------Direct replacement for Dexter 023-434-00 (K23-434-00). Commonly used with drums marked 8-218 and 8-285.-----------Includes one left-hand 12-1/4" x 3-3/8" electric brake assembly with cast backing plate.----------- All brake components are pre-assembled for installation.--------Important: Verify brake size and confirm your axle uses a 4 bolt mount before ordering.-------- These assemblies will not fit other mounting patterns.