For most Nissan applications, we utilize different size sleeve lengths for our lineup of clutch kits. The number references the sleeve length in millimeters needed for each clutch.
We sell Release Sleeve Assemblies which include the bearing installed onto the required sleeve. To order the appropriate bearing, just input the sleeve length required into the core part number. For example:
NS001-012K = 12mm Release Sleeve Assembly
NS001-014K = 14mm Release Sleeve Assembly
NS001-016K = 16mm Release Sleeve Assembly
If you already have an OS Giken supplied Release Sleeve assembly, but wish to confirm which length you have, please measure the sleeve length as depicted below: