https://www.stovebolt.com/ubbthreads/ubbthreads.php/topics/1089476/1.html

This guy has installed a dual master/booster on his 2 ton. I think it was part of a front disc brake kit put together by 'RDomeck' so the master would be a drum/disc.

I tried to get one of them to cough up part numbers with no luck. Seems as though when it comes to making money with a kit part numbers are not something that is shared !?!