Yeah, I'm trying to avoid having to cut. I'm using some that I cut and I just can't cut them even enough so when I place them on the shields, which is a perfect oval, it highlights the defects in mine.
That's a cool link BT and you failed to mention that you also use magnetic stock and stick the out of rotation labels on your fridge. I thought that was too cool!
If you can't find what you're after, try getting an oval-cutting template from your craft-supply store. Use an Exacto to make the cut and you'll probably get a shape as precise as the oval you're trying to match.
Here's the first thing I found on a google search: