69 dart disc brakes conv.

Yes, the caliper adapters from a larger car, 77-? Cordoba, Charger, Road Runner will allow you to use the larger Rotors. There are 2 different systems, Pin and Slider, you probably have the slider system. The adapter brackets from "C" bodies may also work. Mopar Action has a tech article on line for this swap and gives adapter info as I recall.