Kohler K-1913 Guide D'installation page 22

Install the Mounting Brackets and Pulley Assemblies (cont.)
Repeat with the second mounting bracket.
Install the Pulley Assemblies
NOTE: Make sure each pulley assembly is located on the side it was originally installed on.
Position a pulley assembly onto the mounting bracket.
Align the mounting holes in the center of the slot.
Secure the pulley assembly to the mounting bracket with the provided red screws.
Repeat with the second pulley assembly.
1128532-2-C 22 Kohler Co.