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1. Here is the 12-bolt version of the Perfect Launch cap support cover from Proform Parts and the other stuff required for installation. The cover is made of thick cast aluminum and coated in a satin black finish. The key feature of this cover is the two load bolts that thread through the cover and put pressure on each main cap, adding support and reducing ring gear and cap deflection. The cover comes with the mounting hardware, but you will need to get a tube of silicone and two quarts of axle fluid.