When installed on 1200-1600cc engines, this part is inside the gland nut. On T4 engines it's in the flywheel/crank. This centers the input shaft on the transmission. Noise when clutch depressed is the clue that tells you it's bad. This part is ONLY used on standard transmission engines.
If you have a Type 1 and are ordering a gland nut, you do NOT need to order this, as replacement gland nuts come with a pilot bearing already installed.