eBay's policy on the sale of clothing is, quite rightly, that if the size is correctly stated the customer cannot return it as "not as described" just because it doesn't fit them.
Unfortunately, eBay still seems unable to understand that it's entirely different when a car part doesn't fit the the car it was sold as fitting. In this case it IS not as described.
This continues to happen time and time again. So much for eBay's supposed AI, which I have long suspected is little more that mindless scanning for key words.