The new Monoblock Gear Clip 1.5" is now LIVE over at V Development Group. This is the newest development from Discreet Carry Concepts. It is designed to directly replace your existing two screws plastic quick clip (link for demonstration purposes). These are designed with real-world retention to exceed that which a plastic clip can offer. If you have a plastic clip this is the upgrade you must do. It is the best possible upgrade for those types of holsters.
The hole pattern is specifically cut to match two screw plastic quick clip holsters so if your holster can already accept two discreet clip MOD4 clips, for example, then it likely won't be able to accept the Monoblock.