M-Parts two 12-1/4” Electric Trailer Brake Magnet Replacement Kit for 10k Brake Assemblies. Works with most 9,000 - 10,000 lbs trailer brakes including Alko, Dexter, Lippert, and Rockwell. Kit includes 2 magnets with wire, 2 coil springs, and 2 retainer clips. Cross 4738-23 Rockwell.