This is A 1954-1956 ford and mercury power brake booster and master cylinder, It is A dual reservoir master cylinder. This is designed to work with with drum brakes or with disc brakes. You will have to modify your brake lines to install this unit.  If you are using disc brakes we sell the correct proportioning valve for your ford It is in another listing. .  We welcome your questions. All parts and pieces sold separate.  No firewall modification required

Complete 1954-1956 ford front disc brake kits are available for $799.00 

This booster is for passenger car applications only not ford truck