I put the 4 bolt to 2 bolt adapter on the 69 Dart. It was aluminum master cylinder with the plastic tank. I got the entire set up from Rick Ehrenberg. I have had no issues with the brakes on the Dart whatsoever. I attributed it to the fact that the 73-6 disc spindles and calipers were used with the correct distribution block for manual disc brakes. I was fortunate the donor car was also a manual disc. Maybe I should get another kit from Rick and install that on the 70 Satellite. Glad everything seems to have worked out.