Backing Plate Mounts to Bracket By 4 Bolts 、 Must Be Welded On
Approximately a 1-5/8" Center Hole
Bracket Measures 3-3/4" x 3-3/4, holes 3" on center、 Distance Between Holes (center to center) ABOUT 2-7/8"
Most modern 7" and 10" Electric Drum brakes use the same standard 4 bolt square flange. (7" brakes are used on 2000# axles, 10" brakes are used on 3500# Axles)