Hey there, and welcome to the Fiat Fourm!
hmm i hope this helps on your question:
you can use standard 2 wheel drive struts. doing this you will loose 2cm of ride hight, but that would be recovered if you were to use the 4x4 springs on the 2x4 struts.
you will find that 2x4 struts will be much more easy to find (and cheaper) than 4x4 struts.
you can find them on Ebay too.
one strut will fit both sides of the car too so no looking for a left and a right.
while you are in there check over your ball joints and see if they have any play in them. if they do, they need to be replaced.
same go for the CV boots.. check them over, if the CV boots that are fastened onto the gearbox ever get a hole in them, the gearbox will loose all of its oil. the bad thing is, this could happen and you would not know about it until noticeable permanent damage has been done.
its a shame they dont make silicone CV boots for cars.
enjoy the little scamp of a car. they are great fun, and come the snow fall you will have a smile on your face.