I am in the process of converting my rusted out and missing drum brakes in the front of my 53 GMC 150 and replacing them with Disc Brakes (from 2007 Savana) using this forum thread. https://67-72chevytrucks.com/vboard/showthread.php?t=647049
What new master cylinder should i purchase? I know I want a dual master but I dont know what bore or size. Any help is appreciated.