Yes 6S2020 you posted pictures at least one. Have a fair number of pittman arm pictures from additional examples built in the later half of 66 production.
While we're discussing the subject service replacement pittman identified by C5ZZ-3590-A Have a blue mark on them.
Idlers (not really the focus of the thread but have been mentioned) can find found with the following - If they were correctly placed in the correct box or tagged correctly
C4DZ-3352-B with yellow mark
C5ZZ-3352-B with blue mark
C6ZZ-3352-B with yellow
Just sharing
For others reading the thread these details are specific to year and application please, please don't rush out and add paint markings to you 68 based on what you read in this thread.