I RECENTLY got a disc brake set up from 67 firebird 4 piston type and i was wondering shouldn't the piston in the master cylinder be shallow? well the one i got is deep and i was just going to buy a new one since i work at kragen should i buy one specific for the 67 year because when i went to look one up for 68 kragen only stocks one for drum application 67 has one for disc brake but looks different from the current one i have nowcan i get any master cylinder from 67-69 as long as it is disc brake one and for power brakes? thanks sorry if it is confusing