When my passenger side mirror corroded and snapped in two a few months ago I was disappointed to find that an unpainted replacement would cost me £175 new and a second hand one on ebay around £100. I was also disappointed that it seemed that there were no aftermarket mirrors available for the Z3. When a part fails on one of my cars I like to replace it with a better part, so spending £175 on a replacement standard mirror was not an option for me.
I then found out from fellow board member TerryO that the Vittaloni California mirrors have the same bolt spacing as Z3 mirrors so bolt straight on with a bit of modification.
These mirrors cost me £65 in total to purchase and fit on the car
Here are the pics