The reps are Soft in comparison to OEM. OEM is a solid shaped part.
Rep will deform over time and not fit perfect.
Also all the reps ive seen arent the same on the bottom.
Oem is shaped to fit the underside perfectly.
All the reps arent shaped to exact fit down there but look close cause of the supporting screws.
Oem is oem no matter how u look at it.