This is a simple rubber gasket for the power steering reservoir cap when it starts to 'sweat' or is leaking. You don't have to pay extra for it. Some reviewers say it doesn't fit. Well I'm guessing they didn't remove their original flattened gasket which camouflages well with the cap as it's black. I have attached photos to prove it fits. Please check the liquid level after the installation is complete. That took me 2 minutes.