Well I received both mounts and, due to the additional angle provided, I prefer the mount as shown on the 2nd post. I had to trim about 1/8" lengthwise, which took about 30 sec. with a small file. The part that slides into the G1W slot is also slightly thicker so I had to file down a bit on each side until the mount could slide in. One could also widen the slot on the G1W but then you would not be able to use the original mount as it would then be too loose. The original mount can come in handy if you want to temporarily install the G1W in another car for example.
On a sad note, while I was installing my new mount, I think my G1W is shot. It was working perfectly the day before and now nothing. Don't know what to do as resetting does not help.