When you refit your headlight unit to the headlight shell, you may find the old springs brittle, broken, or maybe you lost one during disassembly.
It would be sensible to order perhaps one or two more than you actually need, just in case you have a few flyers when refitting your headlight unit!
Please make sure the part numbers you order are correct for your model. Add as many parts as you like to your shopping cart in one hit to minimise shipping costs.