OK , my 06A Z28 is Norwood. Round with paper gasket as previously posted.
Guy I work for has quite a collection of cars, I Looked at his 1969 09A L89 Camaro Norwood car, today and it is round, paper gasket, it looks refinished, cant say if it is original or not. He also has a 20 K survivor 02D 1970 Z28, Van Nuys car and it has round with paper gasket, cap is identical to 69, same lettering and logo. He also has a 70 Ram Air 4 TA , 18 K survivor it is the same, both caps have patina and look original IMO. I have pictures of ALL caps, but having touble posting them. I also have a NOS round eared cap like in the ebay auction.
Hope this helps.