First off is a MRG-1. I'd obtained this a few years back in good condition:
I seldom wore it as it was a fairly rare watch to find locally and unfortunately the resin bezel crumbled a couple of months ago. I couldn't find a replacement anywhere and as I looked at my other screwbacked Gs had a 'Eureka' moment. The GL-110 looks to be about the same size, hmmm. the crystal size looks about the same too, wouldn't it be great if the button and screw positions be in the same positions as well?
The buttons on the GL are larger and square bits whereas the MRG's are the regular round metal ones. Putting one watch on top of the other they looked more or less the same alignment and I decided to give it a shot. Here's the result:
On my wrist with a new replacement GL-110 bezel in black
The side view shows the square opening where the GL-110's buttons would fit but as you can see, the MRG's buttons are in the center of the openings.
So overal result isn't too bad. Aesthetically the lines and curves of the replacement bezel seem to blend quite well. As seen from the second pic on the wrist even the top part of the bezel doesn't obscure the etched "G-SHOCK" and "TITANIUM" letterings on the MRG face's top and bottom.
I'm not sure on the availability of GL-110 bezels elsewhere but in Singapore I had obtained the bezel from local supplier, Marco Corp.
Hope this is of some help to MRG-1 collectors here.