Mercury Mariner Outboard 225 3 Litre Service Manual 1994, Page 344Get this manual
STEERING ARM EXTENSION BRACKET INSTALLATION Secure steering arm extension bracket to each outboard's steering arm Thread steering eyes equally into coupler, so that distance between hole centers of steering eye ball jOints is equal to distance between threaded hole centers of steering arm extensionsExposed threads of steering eyes MUST BE of equal length and threads MUST NOT extend out from coupler more than 2-34 in(70mm)
aCouplerRubber SleeveSleering EyeRubber BushingJam Nul
aSteering Arm (Port Outboard Shown)
bExtension Bracket
cLocking Retainer (2 Each Bracket)