Vertical Arm must clear door opening.Center lift in door opening. Side to Side Alignment Align(Parallel) Align(Parallel) Lift towers and vertical arms must be parallel (aligned) with vertical sides of door jamb andperpendicular (90.) to the vehicle floor. Figure B Installation Kit 30955K suppliedin lift parts box. Detailed instructions supplied in kits. Figure C Edge of Finished Floor or Stepwell Filler(not outboard edge of vehicle) Inboard Edge of Threshold Warning (Top) Plate(with plate folded