It sounds like there may have been some miscommunication. We haven’t ever offered many kits for the 1973-76 A-Body/Dart spindles, though we do have options for the earlier 65-72 spindles as well as the 73-76 B/E body spindles. Perhaps you were looking at one of these applications?
The 140-11019 kit is specifically designed for use with Magnum Force 2.00” drop spindles, which is how they come into the mix:
140-11019 kit
140-11019 kit specifications
140-11019 kit fitment listing
