I've used these Safarilaminate belt holders for years, and they're a nice way to carry COMP-1 and COMP-2 speedloaders. The speedloader straddles your belt and has a relatively flat profile with very little printing.
The only real caveat is that the kydex layer does eventually crack from fatigue from repeated opening and closing, but it still retains the speedloader just fine as long as the rest of the material doesn't tear and the snap is still secure.
Well, that, and they seem to be getting harder and harder to find as revolvers disappear from police service.
If you do find them for sale, however, I highly recommend them.
Safariland "Split Five" and "Split Six" Speedloader Holders
Linear Mode
