Porsche 996 TT Repair Manual page 481

einordnung
Mount new O−rings onto the bushings. Grease O−ring area liberally.
Mount outer bushings in the cylinders. Align the bushings in the cylinder. The flattened areas must face
towards the other bushings in longitudinal direction.
The recesses on the bushing must align with the bores of the
studs.
Mount the outer bushings with pushing device special tool 9660.
Installing pistons and cylinders 418