This was the 3rd ADM product I bought for my scopes. Good company. This fit my original CGEM just fine. I bought this dual-saddle version because I was looking for a way to attach my StarSense Autoalign camera directly to the mount, so I wouldn’t have to move it from scope to scope, depending on which of my scopes I wanted to use. I machined an L-bracket to fit into the ‘Vixen’ slot, and attached the camera to the end of the L. This allows the scopes to be placed into the D dovetail slot. Of couse I had to drill & tap some holes into the ADM saddle. No problem. I haven’t had an opportunity yet to use it yet. But I think this will save me some aggravation of moving the camera and re-aligning.