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the fittings should be the same.(on the condenser)if you are adding an r134 condenser to your r12 system,way to go! with the higher operating pressures of the blended refridgerant, the newer condenser is a higher b.t.u. and will lower your liquid charge temp for better preformance. be sure to flush it out though because the oil changes between the two refrigerants. a drier is always a good investment.