This is Yoyodyne part #11502. I never installed this flywheel because they sent me the wrong one. I'm not sure what year this is for but it's not the same version as the one on my bike. Mine is splined and this is not. I waited too long to return it so they wouldn't take it back. I'm asking $90. I'm attaching a link to the part on Yoyodyne's website:
I'm in San Francisco.