WARNING: For all members who have replaced their stock seat/backrest with an aftermarket product: The New Style BRP passenger armrests(219400839) for the RT are ONLY compatible with STOCK backrest. I discovered this today when I took my RT to my local Can-Am dealer to have these installed on my RT Limited with an Ultimate Passenger Backrest in place of the Stock Backrest. The 2-horizontal support pieces(one on the left side, and one on right side) do not allow a non-stock backrest to be reinstalled properly. This was a very expensive lesson(2 hours of labor), not to mention the time involved.
I would have to figure that this same issue would apply to the F3 also.
Mike