Manual brake pushrod

Hello I know I posted this before but I cant find my ad.but I have 73 plymouth duster.it has power brakes.im converting to manual brakes.i need the right push rod.what is the length it needs to be?And hope someone has one.my booster is shot.my master cylinder is shot.it doesnt want to stop.its crazy.and it' my only car daily driver.please help.i have money to buy one right now.thanks