I apologize for not saying so, but I recently learned that my friend who initially made the request indicated that the prop from a 150 is too short to work on the Cub.
It's experimental, so I don't see why it wouldn't work. But, you don't put a 172 prop on an RV...maybe the opposite speed conversion applies, here. The Cub is more draggy, and thus, slower.
Thanks for the feedback and offers of the propellers.