These calipers fit our rear disc brake kit brackets. If you have a 81 on Land Cruiser or a Mini Truck, your parking brake was a part of the rear drum housing. The biggest obstacle in converting to rear disc brakes is making another parking brake on the rear axle. This is what you need, these caliper have a parking brake built in. You adapt your factory cable to these and your parking brake will be working once again. This also works with the early kits as well. This is an unloaded caliper set. The best part is no core charge.