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I have heard that it is possible to swap Kawasaki KX450F links between model years. I have a 2013 KX450F and my friend has left-over links from his 2006, 2007 and 2008 KX450F. He said he would give them to me. Are any of these links any good on my 2013 Kawasaki?
No. Your 2013 KX450F has a 135mm shock linkage arm arm. Your bike benefits from an aftermarket 136mm link. The 2006 KX450F has a 132.5mm link, while the 2007 and 2008 have 131.5mm links. Free or not, they will not work on your 2013 KX450F.