After cutting off top and post here is a list of what I used. 29 roadster windshield cut 4". Some filling is needed. Roadster windshields are not square. 1" angle for mounting bracket. 3/8" ID tubing for stud spacer. 1/4" rod for base. 1" freeze plug for windshield stud spacer. I made a cardboard pattern to determine shape and angle.