Here you have pictures. There is space for extra inch on every side, but it would be very tight fit. I wouldn't bother with it as 22" and 16" come as a kit and if you insisted on 18" you would have to buy every blade separately and at least here they usually stock kits and its not easy to get bosch aerotwins as separate blades.Changing the subject slightly (Sorry) but I remember reading somewhere that you can fit 22” and 18” (Instead of 16”) sized wipers on a 147 GTA without a problem. I have always thought the little 16” wiper on the passenger side looked silly and pathetic!!!!!! I assume it would also wipe away that small triangle bottom centre of the windscreen.
After a bit of searching, thought I'd try and contact a few big Alfa stockists, managed to locate a set of GTA blades (drivers side one has a spoiler fitted), with Alfa logo. Must be just about the last set available. Now fitted to the GTAHoly resurrection !!!!
I've notice that one of the wiper blades as started to spilt on my GTA......they only get used on the MOT !!!!
Been in touch with the Alfa dealer as I want the Alfa logo on them, and been told that the part is no longer listed !!!!
Any tips - I guess I'll have to go for refills as I want to keep them original