Which "drag race" master cylinder?

My brake bracket is actually drilled for a 2 or 4 bolt setup. As ironic as it is, I kinda wanna make sure its aluminum I guess the little extra cash is worth aluminum vs cast iron. But if I can source the oem chrysler one for 40 opposed to 100... probably going tha route. I found another eBay one for 40. Claiming cast aluminum. 1 1/32