My new 2017 NT came with the swing out bumper mount attached and the Flame King grill in a box under the bed. I put the handles on the grill but there is no way to attach it to the swing mount. After a bit of looking online I determined I do not have the hanger arm assy (WAL614001). There's no way it would fit in the same box as the grill so I'm guessing it would be in it's own box. Does anyone know, should it have come with or is it something I would need purchase on my own?