65' brake question #2--dual master cylinder

I want to replace my stock jelly jar master cylinder on the GT to one with a dual master cylinder.

It has the factory standard DISC brakes on the FRONT, and the standard DRUMS on the REAR. Of course it has the factory proportional valve mounted for the rear drums.

I've considered using one from a 67' disc brake stang, but have heard that there may be an additional valve located near the rear axle. Don't know if it is equivalent to my GT front mounted proportional valve. The 67' disc type also has is power controlled, which is something else I wish to install (separate post.)

Anyways, what dual disk brake master cylinder should I use on a basically stock 65 GT with or without PB?
 
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