From OE sources

For the N18, N16 and N12 engine.

Contains

• 11 31 8 618 318 – Timing Chain
• 11 31 7 607 551 – Timing Chain Tensioner
• 11 31 7 577 631 – Upper guide rail
• 11 31 7 577 301 – Guide rail
• 11 31 7 533 879 – Chain tensioner rail

Also available;

TCK126 - MAR Motorsport OE N14 Timing Chain Kit

TCK126A - MAR Motorsport OE N14 Timing Chain Kit

TCK126B - MAR Motorsport OE N14 Timing Chain Kit with Gears, Bolts and Gaskets

TCK126C - MAR Motorsport OE N14 Timing Chain Kit with Vanos, Gears, Bolts and Gaskets

TCK127 - MAR Motorsport OE N18 N16 N12 Timing Chain Kit

TCK127A - MAR Motorsport OE N16 N12 Timing Chain Kit with Gaskets and Gears

TCK227A - MAR Motorsport OE N18 Timing Chain Kit with Gaskets and Gears

TCK127B - MAR Motorsport OE N16 N12 Timing Chain Kit with Gaskets, Gears and Vanos

TCK227B - MAR Motorsport OE N18 Timing Chain Kit with Gaskets, Gears and Vanos