Hey SHez, welcome to the site. You shouldnt have a problem fitting 16" to a cab, Mine used to run 17's with no problem. I've even seen a mk1 cab with 18's. Try ordering them from the US if they do them in 16's out there, or go to a reputable dealer who will try their hardest to get you what you need - it is there job to after all.
Providing the offset is correct (this will all be checked for you by a good supplier anyway) the wheel will be a direct replacement for your present set.
Ever thought about going the other way and getting smaller wheels though? (see my sig pic below)
Hope this helps
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