making my power supply compatable for new macbook air

hi

I recently purchased a new 11" MB Air. I noticed that the power supply for my 13" macbook was not compatible with my new 11" model. I also purchased an apple display and with that display came a little adapter that slotted over my 13" MB power supply which then fitted my 11". Can i buy extra adapters as i have a number of MB power supplies?

Thanks
Gavin

Mac

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