[NewArt]

Like the hardtop, there is a certain market for these. Apparently, they use the same spinlocks as the hardtop. If you bought your car from this same fellow, the spinlocks are probably already in your car. If not, the set will cost you about $165 Canadian at the Porsche dealer.
As for the aesthetics, it's a question of taste. Your son thinks they're cool. A bit too batmobile for me. If you sell them, be sure to mention that you will include the spinlocks (which means you have to remove them from your car, or not).