Classic Performance Master Cylinder CP31501-C Brand new. This would be for power brakes. It has a 1.125" diameter bore. Made from aluminum and chrome plated. more than 6 weeks to get one shipped. Here are more details and where you can also buy it: https://www.summitracing.com/parts/clp-cp31501c

I will be in Florida for a few weeks in March if someone is from that area for pick up. Otherwise I can ship from here or there. Shipping prices are around the same I believe.