Another GMCer graciously sent this flyer to me. It is the one from which he ordered and received his Centerline Hitch in July of 1993. Total cost was $288.70 which included shipping from Utah to Illinois. I believe it is the one from which current production hitches are based upon. He says "As far as I can tell, Blaine Merrell's version is true to the original Gemco Centerline hitch that I have in every respect including the precise tubing for the receiver, unlike some other versions."