Mercury Mariner Models 135 150 175 200 Service Manual, Page 578Get this manual
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LEFT HAND NON-RATCHETING
a -Stud Adaptor (from 91-44307A1) -Stud -Backlash Indicator Tool (91-78473) -Dial Indicator Holder (91-89897) -Dial Indicator (91-58222A1) -Dial Indicator Pointer