This KIT is only to add or replace the Long Back Sled, with the Lowboy and Riser to 2017 Ultra Flex Plus Models - will not work with legacy Ultra Flex Model.
Includes:
Long Back Sled
Low Boy
Riser
Thumb Screw for Back Sled
Inline Screw for Back Sled
Thumb Screw for Riser
Works with all 2018 - Current Ultra Flex Plus models - but will not work with legacy Ultra Flex Models
Works with all 2017 - Current Flex Plus Models - but will not work with legacy Flex Teleprompters