The 03/04 Cobra Master cylinders have the end bleeder which really comes in handy if you happen to get air in the very tipped cylinder during brake work or bleeding.
While there are others that are functional with this caliper set up, it's nice to have that bleeder, rather than have to remove the master and bench bleed that trapped air out.
Even the 2000 Cobra R cars did not have the extra bleeder.
If I was building an early SN95, that is what I would put on mine, 03/04 Cobra master cylinder FTW.
Jimmy Still kicking! Jr. Technical Support Engineer with Royal Purple Synthetic Lubricants <-and LOVING it!
Mods page http://www.gotstang.com/webpages/Jimmysidecarr/2004-svt-coupe-539-Mustang/mods/