I agree,that's the same wheel my friend had before he sold it.
To summarize for Chevrolet:
*1970 RPO NK-1 is the optional
Cushioned Rim madrid grained vinyl 3 spoke 15" steering wheel,part #3952700.(larger 16" thumb groove is the Buick application)
*1971-72 RPO NK-2 is the optional
Deluxe Custom madrid grained vinyl cushioned center & rim steering wheel,part #9752131.(Cjoe pic above)
*1971-72 RPO NK-4 is the optional
Sport madrid grained rubber coated 4 spoke steering wheel w/simulated stitch,part #3978125.(pic below)
