Kelsey-Hayes replacement

The A-153 rotors are Mustang style rotors modified to work with SSBC's caliper adapters, which are made to work with 10" drum knuckles and their K-H like calipers.
I called them and asked if they would make a replacement rotor for Mopar A-Body K-H brake systems. They couldn't have seemed less interested.
The previous incarnation of SSBC burned a lot of people. Vendors, customers and employees all got hurt. Not that this company would do the same, but it illustrates a risk of using proprietary parts from a small company.