In the same way I provided Karl with original Safariland 1001 components so he could build his Deckard holster (2 years of fighting between us went into it), I was also able to identify that the Safariland 254 duty holster was the original unit used by the production for the LAPD police in the film. I combed through catalogs I’d accumulated from doing my research on the Deckard holster to make this more recent discovery. I'm announcing the info here for the first time if someone else hasn't already figured it out.
After providing Karl with original Safariland 254 duty holsters, he was able to create this version, which I’ll also be making available (as his official distributor) soon too -- probably starting this weekend on ebay and my prop website.