Thanks sd, I looked at that one for quite a while but it looked to me like it wouldn't go in the circle cutout because of the way that the face plate is oriented with the
compass body at an angle... not perpendicular. I saw it in the defender catalog and that says the mounting hole needs to be 5.75 inches...
I can always make the hole a little bigger if I need to but just wanted to check and see if anyone knew of one that was the right size so I didn't have to.