The Iwis 90001311 (BMW Chain Kit 5-03) is a complete timing chain kit including the timing chain, chain tensioner, guide rail, and slide rail, supplied by Iwis Ketten, one of the OEM chain manufacturers for BMW's N20 engine family.

Fitment: BMW N20/N26 2.0L turbo engine, confirmed across chassis including F22, F30, F32, F10, E84 (X1) and F25 (X3), plus Z4 — matching the source's stated fitment.