Let me see If I can be a help, buddy.
I got my front lip on ebay by the seller "baysonr" in '13.
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http://www.ebay.com/usr/baysonr?_trksid=p2057872.m2749.l2754
Unless they didn't changed the way of its production process after '13, the lip is welded by 3 pieces. On the back of the lip, you should see 2 sections that are welded, right around the corner of the lip that are meant to have a contact with your front bumper. Those welded spots on mine had some chunks, not making a firm contact with my bumper, so I shaved those off to smooth them out. I also remember I did the same thing on the entire section for the 3M tape to be attached, or anywhere the lip was supposed to make a contact w/ the bumper.
If your sections are rough / bumpy, try shaving them off. I don't really recall the lip being so off on the test-fitting phase, but my front lip was a perfect fit along w/ the OEM lines on the bumper after all.
Btw, your 01-02 bumper is OEM, correct?
Assuming that you got the lip from "baysonr" on eBay, the only thing I can think of is that they may have reproduced the lip after '13, and its shape got slightly changed somehow.. but it shouldn't be different b/c they would get many complaints, if they really did..
I've seen a few different ways of their packaging by seeing our members' pics. Mine came in "wrapped" by card boards w/ bubble wraps, instead of being "boxed" in a card board box. The middle section was slightly bent since it was only wrapped, so I had to play around with the heat gun to flatten out the middle of the bottom section a little bit.
Hope this helps.