Small (105mm Bolt Circle, 12mm Bolts): Designed for 135i/335i transmissions (N54/N55), B58-based 8HP transmissions, and more. Diesel versions may require the larger size.
Large (110mm Bolt Circle, 12mm Bolts): Suitable for high-performance transmissions like those found in the E9x M3, F8x M2/M3/M4, and most diesel transmissions.
Xi (105mm Bolt Circle, 10mm Bolts): Compatible with E9X 3-series and E6X 5-series equipped with Xi transmissions or transfer cases.
