bait and switch car parts

The gaskets are unbranded with no part numbers. It's just "gasket" along with a price and a picture. I'm a little embarrassed to be honest.
And now I see my item has been removed from the website, except it's still pictured as part of a full engine gasket set at Home

Still there:
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Oh, yeah I see what you're talking about. They're clearly pulling one over on people. If nothing else, you learned a lesson. You could certainly try filing a claim with PayPal, or even try a charge back on your credit card. You just have to decide if it's worth the effort.