I'm watching that auction too. I have my two piece passenger side vent rechromed at a price of $240, and have not taken the driver side piece in yet because the chrome is so expensive.
If these go for less than $4-500, I'm selling my original pieces and buying these.
I know its not original, but I really like that they are one piece instead of 2. 68 vents that are not broken off at the bottom are not easy to find because of the design. And the seller is right, they always fall apart.