On the #974 we have two oval shaped holes cut in the lexan windshield that are approximately 1" X 5". They are located near the top of the windshield near the corner on each side. Hooley drilled a hole on each end and then cut a straight line top and bottom to connect the two holes and make the oval shape. If you have a lexan windshield you might consider this option. We got this idea from the BMR coupe when we were faced with this problem. I might be able to find a photo of the holes if you need one. If your windshield is glass, I am no help to you.
John