Hello all, I've been doing my homework on 308 GT4s in preparation for ownership and have a query that I've been unable to solve so far. Basically, why do some models have what appear to be vents above the rear window, and yet others don't? Specifically they have two pairs of slits on either side of the rear edge of the roof panel. Looking at the images I've seen, the split doesn't seem to be between Dino/Ferrari badging, or confined to a specific set or model years. Does anyone know what they're for and why some do/don't have them? Thanks in advance, Paul.