These bolts and rubber attachments replace the stock engine cover bolts in TDIs. The bolts attach to the manifold and brackets on the block where the stock bolts fit, and the grommets replace the grommets currently on the engine cover. Some filing or trimming is required to fit the rubber grommets to the engine cover. These items allow you to pop the engine cover off without loosening bolts. Order one for a complete set of 3 of each piece (for one vehicle).