As above, but if you do keep them if you can look at the inside of the alloys there should be info on there that will help us decipher if you need spacers
There should be a number preceded by the letters ET, this is the offset of the alloy.
Also there should be a number with a J in it, something like 18xJ8 this would give the diameter and width of the alloy.
Then we can make a good guess as to whether it needs spacers to fit. The centre hole should be 57.1 for an exact fit over the spigot. If it is more then it will need a spigot ring to fit around it so the wheel will sit centrally on the hub.
Hope this helps.
