These Schumacher Racing Products aluminum differential inserts are a factory replacement for the Cat PB 4x4 buggy and provide a +2.5 offset for fine-tuning differential positioning within the chassis. The metal construction offers a durable alternative to standard plastic inserts. Sold as a pair. Features: Aluminum construction +2.5 offset for differential adjustment Sold as a pair Designed for the Schumacher Cat PB 4x4 7/7/26 cs