Dual Master Cylinder Conversion Kit
My '67 Porsche 912 is the last Porsche model with a single master cylinder; from '68 on, they're all dual. This conversion kit is from Klasse 356. It is designed for the Porsche 356, but I have it on good authority that it is OK for the 912 as well. It consists of the cylinder, a new reservoir and tubing, a kit of small parts, and even a quart of high-end DOT 4 brake fluid. The kit makes a lot of sense; sourcing all the parts individually would be difficult. You'd also have to make your own brake lines; a good-quality bubble-flaring tool, probably $250 minimum, would be needed. The cheapo ones just don't work well enough.