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FWIW the catalogo parti di ricambio for Giulia TZ shows a 7 bolt wheel w/ aluminum ring and 4 hole spokes part # 105.10.23.051.01. The TZ parts catalogue also shows hubs in four different lenghts, 34, 49, 64 and 79mm (79 supposedly being standard).
I have seen both 6 and 7 bolt wheels both on TZs and GTAs, also 15" and 14" diameter - 15" is stock on GTAs, but there are ones with 14" wheels as well. Most 14" wheels have 3 holes in the spokes but I have seen 14" wheels w/ 4 holes as well. I believe the number on the bottom spoke refers to who assembled the wheel. Also hubs tend to be specific to their wheel w/ bolt holes between wheels being slightly different - yes you can usually fit an wheel to a different hub by slightly filing the holes. The wood rims are sometimes thicker and sometimes thinner, some of them stained lighter and some of them darker.
From what I have seen, I would say all types of wheels were fitted to the different cars.
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