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I think Safariland use the same attachment system for belt loops and paddles and stuff. It's only 1 inch difference between the belt loop and the low ride belt loop though. I'd buy the 578 first then see if you need a lower belt attachment. I got mine off Amazon.co.uk (which is easy in case I need to return it for whatever reason). Make sure you get the right size for your gun though.
Sadly I am no t very near to Stevenage.
Do you know if the 577 GLS is compatible with the "6075UBL Low-Ride Universal Belt Loop" (I know it says universal, but the Americans say a lot of stuff is universal or global and it isnt'!
ALS is very unlikely to fit. It wouldn't fit my WE Glock. I think you might get away with a TM, but you probably only have a millimeter of leeway in the ejection port dimensions for the ALS to work. The GLS adjusts with retention in the trigger guard. If you're anywhere near Stevenage, you're welcome to try mine to see if it's a fit before you buy.
I have the 578 which is the paddle/belt loop combo. Paddle is really comfy and well shaped though.
The GLS is designed to fit all different shapes and sizes, so it's far more likely to fit your glock than other firearm-specific holsters. For example. My GLS is for a glock 19, but also easily adjusts to fit my Walther PPQ, and while it looks a bit funky, will also adjust to hold my big Kimber 1911. Have a look online for the PDF with the size charts.