I am planning on changing to a double stage cylinder on my 63 f100. Is there anything I need to know before doing it. Is there anything in perticular for the new master cylinder. I know I have to get either a 66 or 67 to get the double stage. Does it need to say for use with front and rear drum brakes? Any other info or advice would be helpfull as I will be making my own lines(flaring them). About how much line will I need? Has anyone used stainless before? Is it hard to flare and is it really nessecary verses steel?