Hi Chris: Thanks! They are Ronal R 39. 17" x 8".
They have proper for the 164 5 x 98 bolt pattern. They need only 5 mm spacers in the rear to fit the 164. Hubcentric rings are a good idea too. Actually, as much as I like them, I just bought yet another set to put on my 164 (I am a wheel "nut" and keep changing them!). Jason from Alfissimo sold them to me. They have been discontinued, but he may still have a set. I see you are in Australia, but I willl probably be selling these soon, FYI. The front wheels have some small imperfections (scuffs), but I would let them go for a good price. Would of course include spacers / hubrings.
Sam
Love the multi-spokes on your black 164. I just purchased one on the weekend and am very impressed (despite getting a speeding fine last night!) just a magic car (and my third alfa). Wondering what model the wheels are off and perhaps the product code, yours is the best one I've seen and I'd like to get the same new shoes for my black stallion.