I have a pair of 17mm Otis LA black wheel spacers with the proper length bolts for sale. Purchased from Eurocompulsion about 3 years ago. I removed these after changing tires to wider ones and they are not needed now. $80 for the pair including bolts, shipping extra (Contiguous USA).

https://alfissimo.com/home/1636-alfissimo-wheel-spacers-5mm-giuliastelvio-pair.html?utm_source=giuliaforums&utm_medium=link&utm_campaign=carenthused