Only three of interested so far, Is that it??
I say "both" ..meaning on each type car. My Giulia Spider Veloce had the metal style fom the beginning ...#390966 now residing in DC, the District of Chaos.It's correct for the Giulia after car number 377276 if anyone cares. The Giuliettas before that used a plain rubber piece held secure by two little screws, one on each end. I've had both. Neither served a purpose to improve performance.