I have a BC 763G, recently i bought a used snow plow w/ right/left pivet. the couplers on the plow Hyd. lines do not match the BC Aux couplers, BC is larger with flat inner covers (plugs i call them), where the plow has smaller diameter with the ball bearing type plug. question which should i change? I heard the larger BC ones are $$$$$ where the smaller one are fairly cheap. but are the smaller ones too restrictive???