Its best to keep to Fiat, Lancia or Alfa alloys, or get aftermarket wheels.
You can get some VW wheels in 4 stud but the PCD is 4x100mm where for a Fiat you need 4x98mm.
You can make 4x100mm wheels fit Fiats with 'wobbly bolts' though.
You would have to make sure the offset is correct, VW wheels have offsets from 32 - 38mm, and typically for a Fiat you need 35mm. 38mm offset wheels would fit with a 3mm spacer (ie takes it to an offset of 35)
But you would have to change the spigot rings for fiat fitment, the centre bore on VWs is 57mm where Fiats have 58mm. You can only change the spigot rings on some alloys, and aftermarket alloys.
Hope this helps.