Hello. Good morning. I have purchase the Speedway disc brake conversion kit for my '40 and the Chassis Engineering adapter AS-2021. It has a 3 1/4" bolt pattern. I need a good one inch bore non-power disc drum master cylinder that is compatible. What's the best one? I hate Mustangs but I will buy one if that's the consensus opinion. I have a '68 Corvette m/c but the pattern is 3 7/16". Thanks!!!!!