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You don't.The unit is integrated and the whole thing has to be replaced.Sneaky VW
yes
How do I replace rear brakes on a VW Polo GTI
You will want to replace a brake light switch on a VW Polo professionally. You do not want to make a bigger situation than you already have. A mechanic will do the job correctly.
The indicator bulb on the VW Beetle wing mirror is an LED which means the unit must be replaced. You need to remove the mirror glass to access the LED.
angle it away from yourself.
replace c/v joints
To change the mirror indicator bulb on a VW Golf MK5, first find the removable panel that covers the attaching screw. Removing the screw will open the panel to give access to the bulb.
http://faculty.ccp.edu/faculty/dreed/campingart/jettatech
http://golfgtiguides.co.uk/guides/remove-mk5-wing-mirror-and-change-indicator/ see the above site...
It has to be professionally done at a dealer or collision repair
New VW Polo for EU market is made in Bratislava, Slovakia.