I ordered a factory top case for my F3T and installed it myself in about 3 hours.
Take your time and follow the instructions on the Can Am BRP web page
http://instructions.brp.com/content... Passenger Backrest&rel_part_number=219400732
Just a reminder that you will have to oreder and pay for the side panels painted to match your bike as well as purchase the amp package to be able to utilize the rear speakers.
Do a search here and read other posts regarding the top case from others.
There are other several less expensive options available, unless you are dead set on the Can Am case.
I love the looks of mine on the bike but looking back I would not do it again.
PM if you are interested in my personal thoughts about the top case.
Good luck and ride safe.