Yes, the rear roof vents were painted matt black on the Gamma coupe. I remember this subject being discussed before so I've looked at the photos from the old forum but couldn't see any close up photos. The photos below are the best I could do. No point in taking photos from my car as I didn't bother painting mine matt black. Have a look at the old forum photos yourself and you might spot something I missed
http://www.lanciagammaconsortium.info/OldAttachmentsGallery/index.htmlAs dor the sills, wing lower qtrs and front/ and ear valances, they were definately black from the factory and I believe it was paint and not stoneguard. It's a design feature designed to "lift" the car and make it look sleeker.