Timing belt change at XC60 D5 Bj 2011

With our Xc60 (D5 205 HP) the timing belt change is now due. After reading here that this is not as elaborate as with VW, the offer of the (885€) really cut me out of my socks. ATU made me an offer over 479€. What irritates me is that ATU wants to change 1 pulley and 1 pulley, Volvo does not have such a thing on the KVA. Here are only 2 straps (Art.-Nr: VO31325042 and VO31330870) on it. Does something go wrong here? Another workshop spoke I don’t see any belts on the Internet, but also only corresponding rollers. Can someone explain what is right here?