I have a 2012 Tacoma. I recently purchased a used UWS truck box for it. In the box was one mechanism for fastening it to the truck. Obviously I need two. The fastener is an aluminum block that slides into the rails on each side of the bed. The block has a threaded hole to accept a bolt coming down from the interior of the truck box. I checked and this is not a UWS part. I've looked on the web and can't find it either. Does anyone know of a source for this fastener?