T-Rex,

The '53 has a two piece windshield. The visor uses the center divider as a attachment point. The '54 uses a single piece windshield. The visor must use a bracket that attaches to the top of the cab.

I'm pretty sure the reproduction visor will have no 'bracketry' to allow it to attach to the cab for the '54 and '55/1st applications.

I think this is how it works.

Stuart