Aftermarket brakes for a 70 Dart?
Stainless Steel Brake Corp. (SSBC) sells a base set up that uses your 10 inch drum brake spindles. It uses K&H calipers with 4 pots originally for a Mustang (so replacement parts are easy), and 11 inch discs like the K&H brakes. The rotors are drilled for both small and big bolt pattern so you can use them with current wheels and change them when ever you are ready for 15" wheels. They fit inside my 14 inch ralleye wheels so they will definitely fit in 14s and 15s.