These top mounts were developed with their sister company, DMS North America to fill a void in the current marketplace for a competitive, durable suspension mount that can be used in any condition. They have developed these mounts for competition use, so it can be assured that no daily driven street car will ever exploit the limits of this part, and they even offer a lifetime warranty to the original owner (excluding normal wear and tear on the bearing). They are so confident in this product that the warranty even covers competition use.
All parts are made using state of the art 5-axis CNC machining out of T6-6061 aluminum, and use graphite impregnated bushings. The bolt holes are made from a technique called "thread forming" which is much superior to the typical cutting tap that others use. It creates a smooth thread that has no sharp points which means the chance of the bolts seizing and jamming on the burrs is significantly reduced.
The bearings in the motorsport version are a high quality stainless steel bearing that is much stronger than the street version. The tolerances are also much tighter allowing for much less play.
These will fit the OEM rear struts/shocks as well as any coilover that utilizes a M10x1.25 thread pitch for the top hat bolt. They will even work on shock assemblies that have an external reservoir.