My plates utilize the factory steel lower plate, reinforced with six grade 10.9 M10 bolts, zinc-plated hardened steel ring, and locking nuts with 6061-T6 adjustable centers and race quality teflon-lined NHBB spherical bearings.
These are designed to bolt directly into any C4, however there is a bit of trimming required at the top to make room for the slightly wider plate base. They are designed for use exclusively with coilover setups, and they will not work with factory springs/strut bearings. They may also work in other chassis with similar suspension setups, such as T44, but I can only guarantee fitment in a C4.
I am currently in the process of building the first set/prototype, which will be tested on my car. After testing and potential revisions/improvements, they should be available to you all at a very reasonable price. Stay tuned!

