Dexter (K23-450-00) 12-1/4" x 3-3/8" Electric Trailer Brake Assembly - Drivers Side 12-1/4" x 3-3/8" electric brake assembly fits 9,000 to 10,000 lb. axles with 7-bolt pattern. Rated 10,000 lbs. capacity per pair 7-bolt mounting pattern - Mounting hardware not included Left hand, driver's side application Read product description below for more information