Yes, the hub is identical
Same 5x110 PCD and same 65.1 mm centre bore: wheels from Fiat 500X bolt on and centre on Alfa Romeo Giulietta without rings. You still need to check the offset and tyres, detailed below.
≈: width estimated from the original tyre size.
Wheel by wheel: offset and tyres
Each original wheel from Fiat 500X is compared with the one from Alfa Romeo Giulietta of the same diameter: how much closer the wheel gets to the shock absorber or how far it sticks out of the wheel arch, and whether the tyre keeps the same overall diameter.
- ✓
6.5Jx16 ET41 · 215/60R16 — Fits like the original
Compared with the original ≈6.5Jx16 ET41 on Alfa Romeo Giulietta: shock absorber side 0 mm, wheel arch side 0 mm, tyre diameter +5.1 % : fit it with the original tyre size of Alfa Romeo Giulietta (205/55R16), not that of Fiat 500X.
Comparison for guidance only (estimated width). Check in detail
Before fitting the wheels
An identical hub is not enough: offset, width and diameter change the position of the wheel, and larger calipers can touch a smaller wheel. Original wheels often use bolts or nuts with a specific seat: keep the fixings intended for the wheel, with the thread of Alfa Romeo Giulietta (-), tightened to the torque shown on its vehicle page. Finally, check that the size is among the approved fitments for your vehicle. This comparison is for guidance only: have the fitting approved by a professional.
And the other way round: wheels from Alfa Romeo Giulietta on Fiat 500X?