Solutions
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ryan-re's post in A qustion on Wipers and Bulbs was marked as the answergo onto wiperblades.co.uk and put your cars info in. I think its 21" for one blade and 19" for the other.
Bulbs: if you had HID's you'd know it so you will have H1 main beam and H7 dipped. There is an entire page dedicated to bulbs in the cars manual if you have it. The manual is available in PDF form at the top of the mk2 octavia section