The detachable solo tour-pak rack (53260-02) is designed for a solo seat. The detachable two-up tour-pak rack (53276-04) is designed for the stock seat. You will need the appropriate mounting brackets depending on which model you choose.
I have that setup you'll need a solo seat I have a Solo Sundowner I want to sell if you need one, I just picked up a Mustang Solo with the built in backrest, so my Harley Sundowner is on the block, Looks New no flaws make offer