I may try a 6" steelie with original centers and hubcaps i.e. 6x15. Not too wide, stock looking, but a little more aggressive, and easily undoable. No irreversible changes to this original car! (Does that mean I have to keep my rear axle and Dunlop brakes laying around the garage.. forever..??)
These are 6x15s with the early recessed caps. (Member here from Holland I think...)
A wonderful Super ! Yes, that day it had original TI Super Campies on it. Made us nervious driving around on such rare wheels !
It sold to another collector in Belgium. He has quite a collection of Alfa wheels too......
Too wide? Maybe. Personal preference. A 7" steel can be a fat wheel on certain 105s, and there are the handling / bump steer / tramline / steering axis / scrub radius / rubbing / etc questions. Alloy changes the look. Different tire sizes on the same wheel change the look and the behavior.
So, a compromise between looks, handling, and cost.
The red Volvo has only 5.5" wheels, but obviously with a very small offset.
I agree, Duetto's look much better when lowered a bit. Here's a pic of mine on the standard 41/2 x15" wheels with 185/65/15's. It's on the Shankle red sport springs and has been lowered even a bit more. The red car in your first pic sits just right!