It is hidden in the listing that you are only buying one cap this is not a set of 4. I understand the need to sell separately those who lost one, but the fact that they buried one, and not 4, burns me. Obviously they couldn't advertise the price for 4 almost $50 because who pays that? Have returned the item. If you need one it seems to be of decent quality and I think it will fit. I didn't put it all the way in because I knew I would come back and didn't want it to get stuck or damaged.