MerCruiser GLM 11405 818763A10 Bearing Carrier Alpha One 1 73020C1 1983-Gen II Piston Sets You can see this in

You can see this in the pictures

OMC part numbers 0913149 / 913149 Rocker Arm

and seems to be just limited to the outer exterior edges

Ultimately it's just a remote switch that you could mount anywhere

Cleaned & repainted

MerCruiser GLM 11405 818763A10 Bearing Carrier Alpha One 1 73020C1 1983-Gen II Piston Sets You can see this inItem Details **THIS IS AN AFTERMARKET BEARING CARRIER EQUIVALENT TO 818763A10 Part Number GLM 11405** MerCruiser Sterndrive Alpha One Lower Unit Bearing Carrier Used in MerCruiser R MR & Gen I (1983 1990) & also Gen II lower units 1991 & Up However, You just need to inspect the casting number to see if the one you are replacing is the right one. This type was the later type used mostly newer stuff using tab washer 14 18323 on Gen I & Gen II Standard