help I need this

I just looked it up online. Try this: BrakeBest Brakes 10-1326M - Master Cylinder | O'Reilly Auto Parts

Edit: I looked it up for my application, which is front KH disc's and 10 inch drums in the rear. It seems to be the same one you pictured in your original post. With a one inch bore master cylinder, it should work great for your Barracuda.

Russ.