has 2 thick spacers that are not washers but are used to adjust for the 2 piece DS angle between the 2 pieces at the center support. So note their position when removing. Also there is lateral (left right) adjustment at the center support to get the 2 piece DS straight fore and aft relative to each other. If you replace the rubber insert of the 2 piece DS center support clock mark all pieces before taking apart so they go back the same way.