How do you Change wiper blade on 406?
Measure the length of the individual wiper rubber One is something like 24" and the other is 21", something like that. Measure it!). Buy a pair of the Bosch twin arms from your local auto spares shop to suit. They should have a book that will tell you what size will fit anyway.
Follow the instructions on the Bosch pack. You will be replacing the entire arm. It takes literally 30 seconds to do each side. Works brilliantly.