I have a 1999 cavalier and I am in need of replacing the rear break drums. I went to advance auto parts yesterday and they told me the 201.4mm drums have been discontinued. So I should go to a junkyard and look for rear drums on a cavalier or a pontiac sunfire.

Am I not able to just get 200mm? I take it 225mm would be to big. Any help would be gracious. Thank you.

I would personally try the 200mm, if the drums drag more than they should, you'll need to have them machined, but 1.4mm is so small a difference I bet they'll work.