Well It doesn't need to be modified just rebuilt. The u joints deff were not just made for Honda, they are mass produced and sold as universal application ...kinda like bearings ...all of the bearings races and cups are available if you know what your after . Honda doesn't list the part number because they want you to buy the shaft assembly. Ford and the rest don't list their u joint part either , they want you to buy their drive axles too ...but the u joints are used everywhere in the world for other applications . I have new shafts never used , but Im keeping them and rebuilding the old ones before I use these beauties