The guards fitment is for stock Motorcycles. If you've excessively lowered or modified your rear suspension, then these may not work.
Road Glide / Street Glide / Road King Models, If you do not currently have bag guards installed on your motorcycle, then you will either have to cut about 4 inches off your bag rail to slide into the bag guard support tube OR If you do not wish to cut your support, you may order the following parts from your local Harley-Davidson dealer.
Bag Rails 2014 to Present:
HD part # 90200504 & #90200505
HD part #49194-09A & #90781-09A