As a 2011 Leaf owner, I can say the eye-bolt that comes with it is 8 inches long, is size M24 w/ 3.00 threads, and has 12 threads. If you haven't already, check that under the little door on the left front that there actually is a threaded socket. If so, it may be unchanged from the 2011 Leaf -- but either measure it somehow or borrow a metric bolt (<-- I entered lowercase here, BTW) from a hardware store that fits it to verify its size. Also, if you haven't already, check the little toolkit that comes with the Leaf to see if it might not have the right eye-bolt there (located in a storage compartment on the left right next to the hatch on my Leaf). Hope this helps...