Unless something has changed since 2004, when I was looking for a modern 4-wheel disc MC to use with a 4-wheel disc setup and decided to experiment with the SN95 V6 MC, I ended up buying a new Bendix MC from the local Ford dealership.
The Cobra MC has a reservoir that has a downward slope to it, as viewed from the back towards the front. The SN95 V-6 reservoir is, more or less, level.
I'm not a proponent of rebuilt MCs but, at the time (2004), I bought a V-6 MC body (no reservoir) for mockup purposes, because it was cheap. Soon afterwards, I found out that you couldn't get the 'level' reservoir by itself but, the sloped Cobra reservoir could be purchased by itself (without the cylindrical, aluminum MC body). ???
If it's still the case that you can't get a new V-6 style reservoir by itself, this means you would have to salvage one from a donor vehicle. --this may be a difficult task. Some of these Mustangs in the wrecking yards are approaching 20 years old now. The reservoirs can become brittle over time and likely to crack if pried off the body.
A Ranger MC can work (obviously MS has one installed). I've never opened up a Ranger MC to see the distance between the seals of it compared to the distance between the seals of a Mustang MC, given that unlike the Mustang, the Ranger never came with rear discs.
On the other hand, the SUV version of the Ranger --The Explorer, did come with rear discs (1995-2001). The Explorer MC is a very close cousin of the SN95 Mustang V-6 MC. The main difference is the ports on the '95-2001 Explorer 4-wheel disc MC exits on the fender side and the bore is 1/16" larger than the V-6 MC. The Explorer MC has the same 'level' reservoir that the V-6 Mustang MC has.
An SVO MC is a more conventional design where you have to take the lid off to see how much fluid is inside. It also has a fairly large 1-1/8" bore and is fairly long. It will work on 2.3L Fox booster in an early Mustang but not on a 5.0L booster (will hit the back of the shock tower). If you aren't running a power brake booster, you may find a great deal of difficulty getting the vehicle to stop with that large of a bore diameter. There was a very similar MC used on the Crown Vic (around mid to late '80s) that had a 1.00" bore. These Crown Vics were rear drum equipped though and not rear disc equipped.
The tubes that come out of the bottom of the V-6, Cobra and Explorer plastic reservoirs are on the same center line of where they plug into the MC. This means any of these reservoirs can be interchanged between any of these MCs.
There is another Ford 4-wheel disc MC I've installed in an early Mustang (1965 coupe) that has the (metric) ports on the left, 1.00" bore and a very large reservoir. It's the MC from a 1995 Ford Windstar. However, like the SVO MC, it's fairly long at 8-1/8" compared to 7-1/2" length for the V-6 Mustang/Explorer MCs. It could be used without a brake booster but like the longer SVO MC, will work with a 2.3L booster but not on a 5.0L booster.
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