I installed the Hydraulic Clutch Master today. But I had to make some modifications to the input shaft and the stock mustang adjustable brake push rod. The stock Mustang push rod adjuster is a bigger diameter/thread than the input shaft coming out of the master cylinder. And the input shaft is too long.
So, in the picture you can see how much I had to cut out of the Clutch master input shaft. How did I know how much to cut off? Fit, measure and mark. And I had to weld on a nut to the end of stock mustang push rod. And putting on that fluid reservoir was a PITA. The O'ring did not want to stay in the groove. I had to heat the plastic resevoir up with a heat gun, and work it many times to get it on without the O'ring slipping out of place. Just one more thing that takes time and patients.
Now everything fits. BTW, that nut you see is a lock nut.