OK--I know this is gonna sound completely crazy--But here goes anyway------I just bought an 04 Q45 that has the 18" chrome rims on it--well-the front 2 are missing the center caps-so I orderd a set off E-bay--My problem is this --I can not get them to snap into place--I know they are the right size because I took one off the back rim to compare--and guess what--now I cant get the back one to go back one! HELP!---Pleeeeeasse!!!-----Thanks guys.............................Larry

I am guessing you have to line it up then snap it in. I looked in the owners manual but found nothing that might help you.

They are sooo oversized it's unreal!---there is a "line-up" mark with the valve stem but even after doing that you would have to have a 10 lb. sledge hammer to make them fit they are so oversized----I thought maybe they sent me the wrong ones but when I took the one off the back rim---it wouldn't even go back on!