Porsche GT3 cup cars come with schroth belts direct from the factory. If you need to replace these belts due to an accident, or if you’re putting the factory GT3 seat setup into another car, you will want to use these belts.
They are specific because of the lap belt attachment. They have a sewn-in bracket that fits perfectly on the factory mount. Standard belts require additional fabrication and a spacer to make them work. These are a bolt-in replacement which makes it much easier. The sub-straps have no adjusters to fit correctly in the vehicle, and the shoulder belts are shorter to reach the works cages with minimal excess.