1998 Mercury 9.9/15HP 4-stroke outboards factory service manual, Page 238Get this manual
CLAMPSWIVEL BRACKETSDRIVE SHAFT HOUSING
Reverse Lock Link Rod Installation (2 Piece Design)
Reverse Lock Link Rod Up-Grade (Refer to MercuryMariner Service Bulletin No98-13)
a-Upper Reverse Lock Link RodEarly design (actuated by cross pin) making contact with lower cowlb-Reverse Lock Link Rod Kit (pn 858338A3)Current design, actuated by reverse hook guidec-Reverse Hook Guide