You can just buy a weld in kit directly from TTT. Just order it for a 240z and cut the provided plates to a 3.75" diameter. Pretty simple actually and works great. https://technotoytuning.com/nissan/280z/240z-260z-and-280z-weld-camber-plates http://img.photobucket.com/albums/v662/jdmgalant4g63T/IMAG0636_zps90341483.jpg