is there a lock for the 13 inch MacPro w/retina?

My 13 inch Mac Pro with retina display does not have a lock where a Kensington laptop lock can fit into. This is a real problem for me, because I am a student and take my laptop to classes, the library and other public places. Is there any way I can lock my laptop?

Kensington SafeDome Secure Lock for iMac

Kensington SafeDome Secure Lock for iMac

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