Re 159 Alloys
I had 17" Shiny 15 Spoke Flat Face original Alfa 159 alloys with 225 50 17 Tyres, ebay item 251167965916, I bought 4 original 18" Horseshoe alloys from italy for 450 GBP inc 140 Euros for delivery to UK, They look fab, I did buy Ace 18" 5 Spoke Wheels off ebay, they where the correct 5 x PCD and correct bore but would not clear the brake calipers on my 2008 Lusso, so I took the tyres off those alloys and put them on the horseshoes. The car handles much better but has a bumpier ride. I would not bother with aftermarket alloys unless you can fit them prior to buying them also the insurance company should informed. Some insurers can load premiums up to 25% whilst other insurers don't. there are various Alfa 150 alloys for sale on ebay italy, I used google italian to english translater to communicate with italian ebayers.