Asked them if their universal model fitted the G1 and whether they would make one specifically for it and they kindly replied the following:
"Well, we don't know if our MC-L fits your G1! We don't have that camera in hand, so I can't tell you for sure. I did attach the schematic for our MC-L plate; perhaps you could sit down with a ruler in hand and try to determine if it will fit? I am sorry, but we don't have any current plans to make a custom L-plate for your camera."
The above mentioned schematic can be found here:
and scroll down to where it says:
Want to check exact dimensions to see if your body can use our MC-L plate? Dowload this PDF.