For things by Yakima, you can probably get them cheaper by not buying them through Ford. Either size B or K is cheaper buying through REI or anywhere else online. $779 B, $729 K. plus another $50 for crossbar clamps which is cheaper than $869 Ford is asking. Any adapters or crossbars will be available directly from them by the time this hits the lots. Usually Yakima has everything on sale a couple of times a year (memorial day, labor day, thanksgiving time) for 20-25% making it even cheaper. That's how I bought my cargo box. If you buy through REI, or other online places, you can get it, if it's the wrong size, return and get the correct size. If you buy through Ford in your vehicle purchase I don't know if you can reject an accessory remove it from your deal at delivery.