As per Bianchi web site, here's the Answer  Scroll down, and find "Model UM84II Universal Military Holster, II" in left-hand column.  Click link, and then click the "Firearms for this Holster" button.  Same holster as the M-12, issued holster.  Remember, the M-12 was issued during the 1911/M-92 transition period, so it will fit either one, and other pistols as well.  All this info is from original (Bianchi) sources, but since I've not tried every possible pistol listed in this holster, proceed at your own risk.  IOW, I'm not responsible for possible Bianchi mistake. 

Note that Bianchi offers other models of their holster which fit a much wider range of pistols., as well as revolvers  Not cheap, since not often found on surplus market.  BUT, not impossible, if one takes the trouble to find them.  Rummage around on Bianchi's web site and write down the exact model number of their holsters that might fit some of your pistols.  Go to gun show, and try to find one.  It CAN be done, as I have done so.  Be Patient.

These "Old-School" holsters have some considerable merits.   Silent deployment, unlike most Kydex holsters. Ambidextrous by design. Very protective.  Very stout, but lightweight.  Can be attached to PALS/MOLLE platforms as-is, or with dedicated PALS quick-change platforms.

Multiple mounting platforms, such as shoulder-holster, or chest-holster.  With top flap removed, the Thumb Break attachment provides some security and a reasonably fast draw.

Not Top Tier nowadays, but Top Tier is not always Best Tier for many users. 

Submitted for your consideration.

 

Thanks, fixed.

Optics Planet sells Bianchi Mil holsters at significant discount.  Chest rig is available there, discounted off Bianchi price.  Sign up, wait for sale, and profit. 

The thing is that Bianchi/Safariland offered holsters that looked to the eye to be identical to the M-12 holster, but which versions fit other/additional pistols.  These "other" holsters are difficult, but not impossible to find.  99.9% of military holsters were intended to fit the M-9 Beretta Service Pistol, but will fit some others.

The other models of what appears to be the same holster are slightly different, and will fit many pistols which the M-12 holster will not accommodate.  

Of course, Bianchi/Safariland OEM prices on the "other" holsters are rather high.  The M-12 is artificially cheap due to the huge number of surplus holsters.  Doing some research on Bianchi/Safariland site and determining which model(s) of holster will fit your desired pistol(s) is essential.

Carefully note the model number of the holster(s) desired.  That model number is impressed into the plastic of the holster itself, and is instantly visible when holding the holster.  Searching for that particular model number on the usual sites might be of use to some, as used holsters abound, sometimes for cheap.