The Gates Micro-V V‑ribbed belt for 2004–2006 BMW X5 with the 4.4L V8 replaces the serpentine accessory drive that serves alternator, water pump and power steering and is specified as heavy‑duty V‑ribbed in the source. It matches the accessory routing for those X5 V‑8 applications and is presented as the correct heavy‑duty V‑ribbed belt for those model years.
Gates 04-06 BMW X5 V-8 4.4L Serpentine - Alt. W.P. & P.S. Heavy Duty V-Ribbed Belt