From Bozen (Bolzano) to Spondinig (Spondigna), then along the Stelvio Road to Prad am Stilfserjoch (Prato allo Stelvio).
If you come from the Reschenpass (Resia) you go to Mals (Malles) and then to Glurns (Glorenza) (except great busses or campers - they first go to Spondinig (Spondigna) and then to Prad am Stilfserjoch (Prato allo Stelvio).