Checked the back of the wheel, the offset is 40.5mm for the Ti 17's.
Alfa Romeo 156 Ti 17" alloy wheels:-
Offset: ET 40.5
Alfa part number: 6068 9800
156 Ti 17" wonky spoke alloys:-
EDIT: how do you embed externally hosted pic's, i can't get it to work using html or IMG codes?
EDIT: I see, you've got to attach them even if they are externally hosted...
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Also, found a bunch of wheel spacers for sale on eBay of all places, 5mm was the smallest available (for correct hub + O/D, as well as PCD).
I've asked a few sellers about 3mm spacers.
Certainly not @rsed to play about with universal shims that will be a bugger every time you (or a garage) takes a wheel off.
Q: Anywhere else that is good for reasonable priced spacers?
My plan at the moment is to get some 3mm spacers cheap-ish and see if the 225/45/17's will go on the front without rubbing the wheel arch, if they do i can buy another set of 225/45/17's in the near future so the axles tyre sizes match. Will need to get good matching O/D spacers or they will be pretty obvious with the open spoke design of these alloys.
Q: Could anyone tell me what's involved in rolling wheel arches and what are the rough costs?
The last time I looked at this technique was many years ago when some fool was taking molegrips to his nova arches...
Do the garage machines fold it fully up, or just curl it round a bit?
My biggest worry would be about stress on the metal and paint leading to rust pretty quickly, or trapped water helping this process if the lip is fully folded back flat.
Hopefully I shouldn't ever need it, but just in case...