Then I have retrofitted the FL indicator side marker on my 2009 Z4 35i
This is the part numbers right and left:
63137303243
63137303244
This is how it looks like from BMW:
Then I separated the indicator in two pieces and sent it for the paint shop. It got back in a Maserati colour called "Grigio Mercury".
Then I mounted them together:
This tap is the only thing you have to do a modification on:
You can brake this tap off with just your fingers, the double sided tape from BMW is enough to get a really good stick to the fender:
Take the old indicator off, this was a little hard:
The connector is the same:
Then it is connected, then you just take off the security tape and pop it in to place:
Result:
The indicator work fine and there is no warnings on the instrument cluster
Good luck