The 'Pin Adapter Kit (PN 8880201)' includes 4 short claw bases, and 4 pin adapters claws. There are a few fits like the 2015 Jeep Grand Cherokee that have very low profile side rails. These low profile side rails require the short claw base only, but do not use the actual pin adapter claw. In this case, you would only use the short claw base with the small claw.
To receive the Pin Adaptor please contact us here, be sure to include your shipping information, no PO Boxes, and will get you the needed parts right away.