Which part of the car are you talking about the side section or the rear and front valance?
The second series Alfetta GTV`s (built `84-86) had the lower sides below the plastic strip painted charcoal.
The first series `75-80 (stainless bumper models) had the centre section of the rear valance between the body seams painted semi-gloss black and the front had a two piece black spoiler painted semi-gloss black below the bumper. This treatment made the rear look a little like a young kid with a spraycan car not becoming IMO to an otherwise fantastic looking car. Both my ser 1 Alfetta GTVs have that piece painted the body colour but the black spoiler looks good at the front.
Richard J
`65 Giulia Ti , `69 GT Junior, `74 GTV 2000, `76 Alfetta GTV, `77 Alfetta GTV, `81 Alfasud Ti, `84 GTV6