For the front from factory yes the Z34 bar is the biggest, for the rear its the 98-99 Z34 but I couldnt get it to fit my 1995 without it pushing the rear wheels out about 1/2" each side. I was also swapping to some modified 2nd gen GTP lateral links but I set them to match the length of the factory links but if they were to be extended to allow for the sway bar I was afraid the monoleaf would pop out of place.