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The cross bars must be removed from the hulls for the initial installation only. 1. Drill out the rivets holding the cross bar end caps in place, remove the end caps. This may require drilling a hole in the cap to insert a large screw driver that can be used to pry the cap out of the cross bar. Remove any excess sealer that may remain in the end of the cross bar. Reassemble the boat. 2. The back rests are not interchangeable. There is a left side and a right side. Note that the forward end cap