Proportioning valve question

[jocko]

Usually an easy pick from one of the many truck being parted on the parts board. Sometimes sellers prefer to sell with the booster which adds weight and cost, but understandable if all is in good condition. Captainfab also sells a custom one that tucks in closer to the firewall - but it may require some thinking as far as the pushrod arrangement - ask the good Captain, he will know exactly what you need. But if you want original, a truck being parted or a WTB ad would produce results rather quickly I'd imagine.