Johnson Seahorse Outboard 10hp QD-20 1959 Bracket & Lever Set 305517 306156 Harmonic Balancer Please inspect the pictures closely

Please inspect the pictures closely as yours should look just like this

Should Fit OMC GM MODELS 4

Chevy GM 140hp 3

Port Head 307263 0307263

These were used in tons of different Mercury / Mariner Outboards and a few models were plastic

Johnson Seahorse Outboard 10hp QD-20 1959 Bracket & Lever Set 305517 306156 Harmonic Balancer Please inspect the pictures closelyItem Details Removed from a 1959 Johnson Seahorse 10hp Model QD 20 with Serial Number 1898275 If you are unsure if this will work for your, please check with your outboards parts list manual or as send me a message and I can quickly look this up for you. Generally Johnson Evinrude used the same parts & assemblies for multiple years before completely changing the design on them so there is a likely chance that this might be compatible with other models