Mine came with passenger pegs, a grab rail, and a solo cover. If it was supposed to come with a pillion seat, I would use it along with my tail bag to avoid scratching the solo cover.
I did something similar with my 10r.. but I used the bolts on the under side of the pillion seat.Yes, it does come with a pillion seat. I had a hard time getting my tail bag to work with the pillion seat because of the limited clearance between seat and tail, and how tight the seat base fit when latched. I unscrewed the seat top from the base, and ran my tail bag straps between the two, re-securing the top and base back together with the screws. Now the seat attaches as intended, and my tail bag is even MORE secure than expected.