Well, after closely examining the seat frame and using a straight edge I found the moveable portion of the railing on the right was straight and the left side was slightly bowed. It HAS to have a slight bow in it. I was able to bend the right side back out with a pry bar and an extension, enough to make both sides equal. Installed the seat, and it's perfect now! Thanks all for your help, it always pays to talk things thorough. Keeps you sharp and thinking if google doesn't have the answer, lol!.