Pn# - DVD03A - 55-72 GM Disc Drum Front Brake Proportioning Valve Lines Bracket Conversion Kit, 1 Set Proportioning Valve, Bracket & Lines for Disc Brake Conversion, New Style - Where the valve is mounted on bracket under master. Comes with everything in the picture - DISC / DRUM valve / Valve Bracket / Brake Lines / Mounting Hardware. Details:This bracket is designed to hold the proportional valve off the passenger side stud of the master cylinder, positioning the valve under the master cylinder. The bracket is used when converting the above cars to dual masters or disc brakes. This bracket will also hold the 4 wheel disc valve which is the same shape.