602-91-304-03K Fits OMC sterndrive mechanical shift stringer (400 series) and 4.250" diameter bullet Cobra 1986-1990 2:1 ratio 13/26 tooth count
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602-91-306-03K Fits Cobra with 4.750" diameter gearcase 1990-1993
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602-91-304-03AK Fits OMC outboard V4 with 4.250" bullet diameter gearcase 2:1 ratio 13/26 tooth count 1978 to current
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602-91-306-03AK Fits OMC outboard V6 1990 to current V6 with 4.750" diameter gearcase
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