I accidentally bought this (I needed the smaller one, this is for 12" tablets) and forgot to return it so now I'm stuck with it, $60 shipped obo it's brand new all the parts are there.
https://www.amazon.com/gp/product/B00O59G2WW/ref=oh_aui_search_detailpage?ie=UTF8&psc=1
How I have mine mounted on my tech deck:
https://www.amazon.com/gp/product/B00O59G2WW/ref=oh_aui_search_detailpage?ie=UTF8&psc=1
How I have mine mounted on my tech deck: