Did some research and found a decent solution for an aftermarket master cylinder. Wilwood Handlebar Master Cylinder (link below). I installed one a few weeks ago and it works great. 5/8" bore for same brake pressure as stock. Unit bled up solid quickly. When I'm able to I'll post install pictures. Comments:
Cost is about about $70 to $80. Easy to find (Ebay, Jegs, etc.). About $10 cheaper than the 16mm universal Magura (which is what I replacing on my bike due to leaks and sticky piston). I found mine locally for under $50.
Engineered and made in USA. Construction is good. Powder coated housing. I've used Wilwood products for years and always found their products to be top quality.
You will need to get a new banjo bolt if you are replacing a stocker as the bolt output port threads are M10X1. Does not come with copper washers for the banjo fitting. I strongly suggest using Stat-O-Seals anyway - reusable and never leak.
Does not come with brake light switch, but is machined for common quarter inch pencil switches.
Does not have a tapped hole for the mirror; its a thru-hole. You will need a mirror with a thread long enough for a nut.
I got the one with the short lever as its all I could find in a pinch locally. The lever off my old magura fit fine on the Wilwood. The Wilwood lever has a park brake / line lock thing on it (great for burnouts!).
Fit has less of a stock look than the Magura since the banjo bolt stick out farther than the Magua or OEM. But being black with the white reservoir, its has the OEM look from 5 feet away or so.http://www.wilwood.com/MasterCylinders/ ... 20Cylinder