Can you ID this Datsun steering wheel??????????

I bought this steering wheel on eBay. I need the horn mechanism. It has smaller spokes and does not have the deep-dish as the 280Z wheel. It also has a plastic ring bolted to the bottom of the hub. The 280Z horn will not fit. Can anyone tell me what this is from? I need to find another wheel to rob the horn parts. Can anyone tell me what this is from? (I cannot change wheels because I installed a new leather cover on this wheel. Ouch!)

Thanks for looking. Hope someone can help. Questions? Comments? Help!