If you opt for the bolt-on CPP unit, the direct bolt-on using your original pedal is a drum/disc set-up with proportioning valve. The drum/drum unit without the valve is NOT available utilizing your original pedal. The only difference between the two is a small adaptor that changes the center of rotation for the pedal, and CPP will not offer that, nor will they offer the drum/drum with original pedal configuration. (And they're quite adamant about it too!) Should you go that route, get the disc/drum boosted tandem master cylinder for original pedal utilization and chuck the proportioning valve. As well as a Hydraboost works, there's a whole lot more involved. Whichever way you choose, replace your hoses!
