Hi All: I have a Losmandy dovetail plate in excellent condition. I used it to mount a Celestron C8 to a Losmandy GM8 with the older style head. The new GM8s have the same head as a GM 11. So, this plate is a little narrower. It will also fit on a Universal Astronomics Unistar Deluxe. As a result, you can go from a Alt-Az to German Equatorial without changing plates. Very slick. Thanks for looking.