Search “Fiat Ducato” → filter “Free Download” → check “Download Original”

grabcad.com/library/fiat-ducato-2021-1

(These URLs are illustrative – if broken, use the search method above.) Try these legal alternatives :

free3d.com/3d-model/fiat-ducato-van-90998.html

3dmodelfree.com/fiat-ducato-3d-model/