1966 dual master cylinder

I think Ehrenberg sells dual chamber cylinders on ebay that are a direct bolt on for early a bodies. I think his ebay username is rehrenberg (not sure about the spelling). I just read Buzzkill71's thread about his brake failure, and he said he has a dual chamber cylinder, so not sure where the failure was with his car.
I seen that in his last post :coffee2: If he has to pump his brakes he has a fluid leak some where or his brakes needed bled or something, I have never had to pump my brakes and his car did not come factory with dual pot MC. If it did That would be news to me, I called NAPA and they never showed a dual pot on a 66 eather, so I am going to be going dual real soon, If front lines break I still have rear.
If a rear wheel cylinder goes I will still have front brakes, just having a single is scary :coffee2: I will check Ehrenberg or rehrenberg with ever, Thank you 64physhy.