Joe,
It would be interesting to know what parts they are using. They've probably discovered a combination of stock parts that work in that application. For example, my '32 Ford roadster street rod has disc front brakes mounted to an original style dropped Ford axle, Long ago some enterprising street rod builder discovered that an Aspen/Volare rotor and a GM "metric" caliper are compatible with each other and would require only a simple caliper bracket to work on a Ford beam axle.like mine.
That allows us to bypass the middle men who make these "kits" by buying the parts directly. To me, that's the real hot rod building mentality at work, finding stuff made for one application and using it in another with good results.
Another example is my Ford 8N tractor. The 6 volt generator gave up the ghost so I found a 12 volt Toyota alternator that was compatible with the 1950s era Ford wide fan belt. A simple 2-wire 1960s era Mopar voltage regulator was recommended by a street rod building buddy, completing the Ford-Toyota-Mopar electric system. It's fun discovering those combinations that work.
