So I am relatively new to Mac's but last year I purchased the late 2009 unibody MacBook and last week I lost the power cord. I am looking to replace it but it costs $80 from the Mac store, yet I am finding older models on ebay for far cheaper (~$20). My Mac has the new "L" shaped plug, however all of the older models on ebay have the "T" shaped plug. I was wondering if there was a difference between the two (other than the shape) and if the "T" plug MagSafe 60W would be sufficient for my needs.