I know of a company in Canada that dose this they take a new 21 series controle leaver and make some changes so the bend is right,they have all the controls on it,but the unloading auger dump,if I can rember right its a plug and bolt in kit and I think the price was around $500-600,but not sure,I saw the picture and it was in a 1688,There contact info is on this web page. www.jakz.ca