Phil,
You might want to contact pull rite to confirm that your intended set up will work. I just bought the 18k superglide and was given the universal plate by the dealer who installed the hitch. Upon inspection the screws which go through the side braces of the plate were missing. I emailed pull rite and they responded within an hour and are going to send me out the missing screws. They did not ask me to fax proof of purchase or anything. A class operation if you ask me. I dealt with Tony in customer service. Tony's email address is
tony@pullrite.com
Sean