As an alternative to realoem.com:
http://www.penskeparts.com/
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As an alternative to realoem.com:
http://www.penskeparts.com/
I saw it and bookmarked it, but someone said they had trouble with it working when inputting a VIN.
At this point, I understand the logic behind the old style ETK interface that RealOEM uses, so I'll be sticking with that for the most part. It's useful to have an additional alternative, though.