Make the mount for the Matco Parking Brake Valve. I decided to use the original (Van's) brake mount and attach the Parking Brake Mount to the Van's mount. This way I do not have to drill out the rivets in the firewall and also do not have to drill two #12 holes in the firewall for the Valve. I also made a small angle to stop the valve arm from going any further down than necessary for the no brake position (control knob all the way in).
