Hi Scott,
I bought the NRG release hub and boss from science of speed. The cost was approximately $420 for the two parts and then I paid a further £40 for customs. The steering wheel I opted for I went to a company called caraudiosecurity and bought a momo steering wheel that was not too far different from the nsx-r, cost was around £160. Told my insurance also that this modification was done mainly for security to which they agreed it is best to tell them as there is no more airbag, so best to have things accurately written on the insurance
Cheers,
Andy