Mark,
I think this might work. As long as this sight does not require a wedge (square notch style mounting) and the mounting holes are 1.5 inches, it should be OK. It should fit a 15/16 inch flat. Two of my Hawken rifles have the longer, "V" notch configuration which you are holding and for sale. I also have another Hawken that has the shorter "square back" style like the one mounted on the rifle in the picture. If you still want to sell the sight, PM me with your address and I'll send you a USPS for $40.00.
Cobra 6