Adapter's outer diameter is 58mm and inner diameter 46mm. This special made release bearing fits at least gearboxes M45, M46, M4500, M4700 etc. Different release bearing adapter heights in stock: 1. B21-B230 for standard pressure plate (height 5mm) 2. B21-B230 xxxx for pressure plate that requires 10mm adapter 3. B21-B230 xxxx for pressure plate that requires 15mm adapter (for example single clutch plate racing setup) 4. B21-B230 xxxx for pressure plate that requires 20mm adapter When ordering, please tell your desired height of the adapter from options 1.- 4.
