Kohler STERLING 547909-59S-G05 Installation Instructions Manual page 12

8. Install the Bumpers to the Header
Left Bumper
NOTICE: The words "LEFT" and "RIGHT" are molded into the bumpers.
Locate the labels on the header and observe how they align with the notches on top.
With the labels on the header facing you, identify the left and right ends of the header.
Slide the appropriate bumper onto each end of the header, as shown.
1417143-2-B
Notches
Labels
12
Right
Bumper
Header
Flat Side
Sterling