Sorry Jake didn't see your post. I used the factory clutch master cylinder from the Challenger BUT it was a bit of a pain to setup in terms of mounting it, you'd probably be better off going with something from Wilwood or McLeod which is more suited for what we are doing in terms of mounting. The challenger fittings also seem to baffle most shops when I took it to them and even now I'm not 100% sure its the true correct fit but its pretty close and no leaks or issues with it working.
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