You have to split your Van Diemen to rebuild or replace the clutch release, so why not install fresh oil tank seals while you're in there? This kit includes all of the O-ring seals you will need to keep the oil in your bellhousing.
Note: The slave cylinder seals are sold separately. We offer a Slave Cylinder Seal Kit for '99-'05 Van Diemen (Part No. 3523-313) which fits the OEM Van Diemen clutch release. We also offer the Tilton Hydraulic Release Bearing Seal Kit (Part No. 163-51) for cars which have been converted to use a Tilton hydraulic release bearing.