Selling a custom monitor bracket a machinist made for me in the past. It will fit a 1.5 or 2 inch post, there are interchangeable mounting rings. It comes with 2 interchangeable length post, 7 inches and 10.5 inches. Make an offer.
XCS Straight Rail Monitor Support Arm for XCS post sizes - $850
XCS Standard Camera Dovetail Plate (Short) - $225
XCS Standard Camera Dovetail Plate (Long) - $225
Shipping not included