I think Martin's point is about using images that may not be what they are purported to be.
Different manufacturers (e.g. Hellebore & Nardi), different diameters, different rim thicknesses, different hubs, as well as 7-bolt w/ ring and 6-bolt configurations are nicely documented in the new 3-Volume Alleggerita by Dasse, Adriensens and Uebelher in the Technical Documentation volume, though it may be missing the iteration with regard to 3 hole spokes on the smaller diameter version.
In my experience, Nardi is a rare option. 7-bolt is much more common on early cars. 6-bolt and small diameter more common on GTAjuniors.
BTW, I have always wondered about the dashboard on Tabucchi's 1600 GTA ... anybody have the story that goes with that?