Master Cylinder for Manual Front Disc Brakes??

Please Help,
Does anyone know the correct master from a 74 Maverick to use for manual front disc brakes? I'm finding a lot of conflicting info. After market parts suppliers list crazy stuff like, rear disc or they don't specify drum or disc for the manual but they do specify drum or disc for power brakes!?!? Local Ford dealer that still has microfiche says that the same master is listed for manual drum AND disc . Would that mean that on the 74 Maverick, it would have an external residual valve for the drum brakes to allow the use of the same master for drum and disc? Summit lists a Dorman number that specifies manual disc, but when I check Dorman's site the number is listed for manual drum and they show a different number for manual disc. I just want to get the right master the FIRST time, without ending up with 3 or 4 Masters that I can't return/use. If anyone can help, it would be greatly appreciated.
Thanks a Bunch,
Gene

DanMan68,
I apologize, I forgot to specify that this is for a 68 Mustang that did NOT come with manual disc brakes. I am doing a conversion to discs and do not want to use a power booster.
Thanx,
Gene

JonK,
Yeah, I use those online catalogues too, usually cskauto. Check that CSK for a 1974 Maverick to view an example of the confusion, they even have a listing for rear disc. I know/understand what I want/need but the listings are lacking details. Yes, it does appear that the one for a 67 Cougar is good and that number is even listed for 67 & 68 Mustang but does not specify in the Mustang listings whether or not it's power or disc. And the info that the guys at the counters/phones have is no more detailed than what we see.

phutch11,
All OEM 68 spindles, calipers and brackets.

2+2GT,
Yep, I agree wholeheartedly, however, many of the re-man masters , even the ones listed for drums, have the different sized reservoirs, and with the lack of automotive knowledge at parts counters these days (the folks who write the listings/ details are certainly no better), we as hot rodders/classic enthusiasts/consumers need to be super vigilant/diligent at checking/double checking that some idiot isn't giving us the wrong parts! By the way, the info that the same master was used for drum and disc came from an older guy at a Ford dealer that actually still has the old microfiche catalogues. He said that it didn't sound right to him, but thats what the "fiche" was telling him. I suppose it's possible that Ford did something goofy? Like switching to using a disc master on drums with an external residual valve?

DanMan68,
I stand corrected and my apologies. It appears that manual discs WERE available in 68, except nobody seems to list the parts correctly! And, by the way, what's a "real parts store"? Oh, yeah, thats one of those "few" things that disappeared about the same time as workers taking pride, responsibility and accountability in what they do. I'm sorry, I'll come down off of my soapbox now.:stirpot:
Thanks All,
Gene

P.S. I finally found what I needed (I think/hope)- Cardone BPR 20-1588