Charlie, this is a 1976 280Z with a 1973 front end, it came with a R200 rearend with ujoint style haftshafts, the R180 use a bolt through the haftshaft yoke . After using this setup for several years we upgraded to 300ZX Turbo CV axles after talking with other Hybrid Z owners ( Thanks to ZGAD, RIP/True soldier, and Paul Korsen)and purchased the stub axle flange adapters from Modern Motorsports.After doing this we have had no axle falures.Jerry