I will give them some credit, they have made some adjustments from feedback. I know DP Racing has also made some mods to their brake kits or made special kits to fit the Apex stuff (for example, their rear disc brake kit brackets would not fit on the Apex rear hubs originally due to clearances).
As RoadRace said, for B sedan vintage cars, there is no real application (although a case might be made the rear mods could be considered "legal", but not really in the vintage spirit of the 1980 GCR).