While it is true that some relica's wrap around the front fender as in above pics - some do not.
Best way to tell is to look inside the spoiler, bottom surface, center - there will be (2) raised/molded in areas:
(1) Will have the OEM Part Number Specific to your car + the word 'Germany' + the BMW Roundel Logo + some other crap + the line '>PUR GF17<'
(1) To the right of above will be a matrix with date code
So either look for this personally, or have seller take a pic of this are for proof prior to buying.
I'd take a pic, but spoiler is installed