I purchased this kit on Ebay, and it works well.
Booster on Ebay
Also exists in 8" and 9" diameter for high-performance cars.
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The main problem with universal boosters is that they have only two mounting studs for the master cylinder (today's standard).
And old mopar master cylinders need four mounting studs.
So, it's easier to buy a complete kit including matching booster and MC.
