How do I know which adapter to choose for my MacBook 4.1?

Hi,
I have a MacBook 4.1 and need an adapter. I know I need an L-shaped one, but there seems to be all sorts of Wattages out there. Which one's the right one?
Thanks a lot for your help!

Welcome to the Apple Support Communities
You have an Early or Late 2008 MacBook, that uses a T-shaped MagSafe. See > http://support.apple.com/kb/HT2346
In your case, you can buy this power adapter > http://www.amazon.com/Apple-60W-Power-Adapter-MacBook/dp/B000FQ245I/ref=sr_1_5?s =electronics&ie=UTF8&qid=1364162769&sr=1-5&keywords=T-shaped+magsafe

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