Should I use an extension power cord instead? I have the following Apple MacBook Pro Power adapter:


  60W  MagSafe PV85 Ouptput 16.5v--3.65A ADP-60AD T
  
  Model No. A1344


Instead of buying a Power Adapter, is it ok to buy an Extension power cord (Found this on eBay)? 

Will I be still be able to charge my MacBook with this?
The extension cord is the part on the right. One came with your power adapter, and it goes between the adapter and the wall. A new one would work fine with your current power adapter but won't do anything by itself.