So a word of warning. I just bought a Corbin Seat, backrest, and Smuggler trunk for my 9. The seat is good, but the backrest doesn't mate to the seat well. Its like they were made by two different people that didn't bother to see if it even fit before shipping it off. I'm going to have to drill into the seat to get the screws for the backrest to align.
The smuggler trunk is such a bad fit that its warped and nothing even come close to aligning with the bolting points. I have to decide whether to demand a refund of just bend the bars and make my own drill holes to fix what was not made well.
Word of warning to anyone thinking of buying these.