Mercedes sprinter wing mirror diagram

SOURCE: How do i fit a replacement nearside wing mirror

You'll need a screw driver (philips is most common), a plastic prying lever, socket (should be 10mm, but can't remember)

If you're lucky, on the inside of the door, will be a triangular panel right behind the mirror that you can pop off. If you're not as lucky and it's one piece or the panel is blocked by the door panel, you'll need to remove the door panel to change it.

On the inside trim, you can remove screws (these screws may be covered by filler pieces or may be visible, or they may require you pry a plastic piece off that covers the screws) that are by the door handle, arm rest, under door and side of door and then gently pull back on the panel as there will also be retaining clips attached and you don't want to break them. You'll need to lift the door panel upwards in order to get it off the window ledge. Then you'll need to manipulate the panel and disconnect the door handle linkage from the door handle and disconnect the wiring for your controls. Then you can remove the bolts holding the mirror onto the door

SOURCE: How do i remove indicator bulb on wing mirror Sprinter 2008

It's been a while, you go through the glass.. the big glass.. grab it lightly
slide it up adn then over left.. the bottom glass.. slide it left and the up and right at the same time.. its a little touchy so be patient.. now i cant remember but i think you have to removed the motor.. then you can access the bulb behind it.. best of luck!!