Shiny, don't joke, your jokes become my obsession
I've still got a nice defroster duct with broken tabs sitting on a shelf in plain view to remind me to try to address this problem.
It would be a very easy print to make, only question would be durability, not sure what the originals were made of .. probably ABS which is known for poor UV resistance. Easy enough to print materials these days that are UV resistant.
I'll try to do some test prints in the next few days to see what materials I think would work.