LOOKED THRU THE PREVIOUS POSTS AND DIDNT GET ANY DIRECT INFORMATION ABOUT WHAT BRAKE BOOSTER PEOPLE ARE USING TO REPLACE THE LARGE FACTORY BOOSTER. I KNOW SOME ARE GETTING THEIRS AFTER MARKET. IF SO WHERE, AND IF ANY ONE HAS ADAPTED ONE FROM ANOTHER YEAR MAKE MODEL OF CAR. IF SO DID THEY FIND A 7" DUAL DIAPHRAGM, CAUSE THE ONE ONES I CAN FIND ARE SINGLE DIAPHRAGM. IF ANY ONE IS USING THE SINGLE, ARE THEY HAVING ANY PROBLEMS.