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I'll start the first discussion with how to measure for cross bars. The various years and models have different length trailing arms. Pre 1999 and 2012 seem to measure about 48". 2000-2009 Diplomat,Knight,Endeavor, and Cheetah seem to be about 51". Camelots, Windsors, Sceptors and Beavers are different yet. So what it comes down to is you must measure to be sure. The attached PDF shows how to do it.