Here are a few of the 1st gen Mustang system #3661 installed with the Wilwood 260-8556P master cylinder:
The 2nd gen Mustang systems are viewable here:
http://www.hydratechbraking.com/Ford_67-70_Mustang.html
We carry a few different typical master cylinders - the usual chromed C3 Vette MC's, the chromed flat type style Vette MC's, and the CPP MCPV-1 design (that has the built in proportioning). You can see these on our home page installed into the Custom Shop Camaro and the CPP Nova builds:
www.hydratechbraking.com
We do not carry the new design Wilwood MC's, though configure for them daily (being essentially an early C3 Corvette MC design with a different look). If you want a really high end master cylinder, you need to look at the SSBC designs:
http://www.summitracing.com/parts/SSB-A0469-1/
http://www.summitracing.com/parts/SSB-A0469-5/
This one below has the built in proportioning valve function also, with the brake line connections tucked way back of the bottom of the MC:
http://www.summitracing.com/parts/SSB-A0474-1/
If you have your eye on any particular MC design, we can likely configure for it.
Give Jim a call to discuss:
http://www.hydratechbraking.com/contact.html