Unfortunately you have discovered one of the subtle design-differences between OEM and aftermarket.

The OE running board dots have a "ridge" design around the dot where it protrudes through the aluminum. This prevents the dot from being pushed back into the hole when stepped on ...

Single black dot pic is from earlier design on e53. e70 boards use a similar design. But dots are tied together in a mat.

Attached Images

  

__________________
PAX5
BMW CCA #20645