In Roy Ramsbottom's tale, there on the first page of this website, he mentions and has pictures of a King and Queen seat, sadly, for an Interstate. Take a look. I would think that there would be more involved in it , than just taking a seat from an Interstate and changing the mounting brackets. If you look at the bottom of your set, the seat "Pan", you will notice that it is molded to rest on the frame tubes, etc.....to provide a firm fit and the ability to take the weight. Double up...no question, you would need the seat to fit on the frame. If you want to keep the peace, you may be forced to buy a new seat pan, and have it lengthened by maybe welding the rear of an interstate pan onto it, so it fits on the frame and then getting it done by a seat man the way you want it to look. Wouldn't be cheap....but it might be worth it, if you get what I mean. The lady is surely worth the cost...:wink:
I have taken an old Interstate pan, and cut it short to do up a solo seat for my Interstate, and it is at the Sattler (seat guy) now. Just getting it covered will be over 150...but it's something most of us can't do ourselves.
Maybe you'll be lucky, and there is just what you want, being sold by some firm.... :wink:
Then again...you could just change it to an Interstate....cool stuff...not having to spend half your riding time at the gas station... :lol: