I think some company made it wrong and other companies copied it with the mistakes and all.

Did you talk to anybody at either company about the problem. All they would need to see is a photo of the product held up to the windshield to see that it is formed incorrectly.

I don't think the visor is supposed to be under tension when fitted so bending it to install makes no sense whatsoever.

1950 Chevrolet 3100 (Ol' Roy)

1939 Packard Standard Eight Coupe (The Phantom) | 1956 Cadillac Coupe de Ville (The Bismarck) | 1964 Ford Galaxie 500 coupe |1966 Ford Mustang (Little Red) | 1969 Pontiac GTO (The Dishpit) I 1979 Ford F-100 | 1976 Ford F-150 (Big Red) | 1995 Ford F-150 (Newt)