I understand that the AAZ pulley is offset a corresponding amount and that a AAZ pump and AAZ pulley will work on a 1.6.
I havent done it myself, but others on hear have said this works. I have both AAZ and 1.6 pumps here so I can confirm that the snout of the AAZ pump is longer, but I dont have a AAZ pulley, so I can't confimr the offset.