Brake Pushrod for 70 Duster disk conversion

I have a 70 Duster that had manual drum brakes and a master with a bolt to hold the top on. I have been converting to 73 up disk setup. Car came with rotors and knuckles. Been ordering everything else. The Master I ordered was for a 73 up manual disk Duster. It has a clamp style top and no pushrod. The original 70 pushrod is stuck to the Guts of the original master after I unbolted the dust boot flange.
My question, Is there a difference in pushrods between 70 and 73?. Was there a manual disk offered in 70 so I can order the correct Master to work with the 73up stuff?