You might also try Stone and Sons http://www.outboard-parts.com/ns5/index.htm
From their website:
Need to rebuild that Johnson, Evinrude, or OMC outboard motor? Well, you've come to the right place!! Stone and Sons Marine offers quite possibly the largest selection of new, used, and rebuilt parts for your Johnson and Evinrude outboard or OMC Sterndrive / Cobra Drive. All of our new outboard parts are factory brand genuine OMC parts. All of our used outboard parts are carefully inspected before we place them in the inventory and inspected again before we sell them to you.
Not affiliated or even own an OMC.
Just thought I would pass this on