Update for those that might have interest. I ordered a hinge from
Plastic-Craft Products The item description is 1x Clear PVC Living Hinge For 1/4" Thick Material – 72." The cost was $25 including shipping. The hinge was back ordered and took three weeks to deliver. The installation was tricky and took two people. I cut the hinge to length and installed it onto the top half of the windshield making sure the hinge was folding in the proper direction. I then drilled four 5/32 holes to secure the hinge to the windshield with ½ #8 machine screws. Now the tricky part. I had to remove the bottom half from the cart. Thoroughly cleaned the windshield edge and applied a small amount of Vaseline. I then set bottom half on a side edge in a vertical position, had someone hold it and then slid the top half into place. It was a very tight fit. I then drilled the four holes and secured the hinge to the bottom half. Hope this helps someone.