Good find on the Hayes Mtn Bike master cylinder.
I really like the slim style of this and how it does not take up much space at all.
But my concern is that it will not be able to operate my new LHRB setup that uses a daul piston KTM 950 Brembo Rear Caliper. I am currently using a KTM Brembo Clutch Master Cylinder to operate my caliper. It provides plenty of braking power that only a slight grip of the lever and the brakes are there! I currently still have my Magura clutch installed but it makes for a very messy left side of my handlebars. I honestly don't think I have a need for my clutch but am still keeping it for a safety precaution...