Realy you want a genuine one.

On replica look out for

-

Side Light fitment

(especially drivers side)
Top section, some are all wobbly

/ uneven
Wheel arch mounting points, some are missing eg on one side but not the other

theres other stuff as well

Genuine goes right on no problem and has all the proper mounting points like the standard bumper, Replica border bumper requires you to drill all the holes etc

Oh Im onto my 2nd Genuine Border bumper, Smashed one up in a crash and luckilly managed to get hold of another a week or 2 after the accident LOL, I think I was VERY LUCKY to find that