Quote from: Special Ed on March 13, 2026, 01:53:16 PMlouvers were not allowed in PA law.
True. Some period Ford ads for the Boss 302/'70 Mach I that incorporated a photo or artwork showing them on a car contained the caveat that the option was not available in Pennsylvania.
I recall that the origin of this went back to aftermarket Venitian blind kits sold in the 1950's, when the backlight glass area of many cars increased dramatically over what came before. Since few cars had air conditioning, it was a means to reduce the greenhouse effect of sunlight in the cabin.
Pennsylvania decided they obstructed rearward vision and so prohibited them. This was enforced by what was then a State mandated twice yearly safety inspection and the State set the rules for compliance. Ford's louvres apparently fell within the law's definition so they were not offered here. The law was eventually repealed so they are OK now.
A company called Auto Venitian Blinds currently sells reproductions of original kits for '50's and newer cars, the attached photo is from their web site.