I just bought and installed the real one for my Model Y, and I can tell you after trying out three sets of the plastic printing carbon fiber looks ones from eBay and Amazon, the Ikon Motorsports carbon lip fit like a glove with no modifications necessary. $500 is steep but honestly, having spent over an hour installing each of the three crappy ones I'd previously purchased, then removing and returning them, it was worth it for the ease of installation alone!
Hopefully they introduce a cheaper printed carbon one because they're the only ones - so far - that have gotten the curve of the bumper right.