If you are looking to replace the seal O-ring on your 996 or 997 cup wheels, then this is the item you need.

This is the special O-ring to fit the sealing ring for your 24 bolt BBS Motorsports wheels.

You will need (four) 4 to do a complete set of wheels.  These sandwich between the two-halves of your 24-bolt BBS wheels.

BBS recommends the replacement of these seals every time the wheels are disassembled.