I need to locate hardware for fastening the upper windshield to my newly restored, 1958 Glasspar del Mar. As can be seen in the photos, the small bolt goes thru the hole in the lower part of the windshield and the rusty bolt with the flattened end goes thru the deck. I tried the Lowes and Home Depot without any luck. Any idea where I might find a replacement part for the rusty piece with the flattened end? The windshield is fastened on top of the cabin.