Jack - The sunvisor I purchased is adjustable for width (side sections slide in and out of center section) and designed to mount by clamping onto on the cab drip rails and center windshield divider strip. I've added a few more pictures so you can see more details.

The one thing to be aware of with the '46 is with it having a crank out windshield, that doesn't work well with the fixed position sunvisor. You would need to either not open your windshield after the sunvisor is installed, or be prepared to loosen/adjust the mounts each time you opened/closed the windshield.

The key concern here is you must have and use the sunvisor center support mount secured to the windshield divider strip. Without that support, driving will cause the air flow to destroy the sunvisor as it's not rigid enough to be self supporting.
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~ Dan
1951 Chevy 3 window 3100
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"My Grandpa Carl's Truck and How it Became Mine"
1966 Chevelle (Wife's Hot Rod) | 2013 Chevy Silverado (Current daily driver)
US Army MSG Retired (1977-1998) | Com Fac Maint Lead Tech Retired (1998-2021)