The non-OEM running boards I purchased from Ebay (SUV Warehouse) do not use a foam insert, they use a fairly heavy solid rubber one. The only way to determine this was to disassemble the running boards though...

We'll see if over time the rubber buttons get pushed in.

I do not recommend using the mounting hardware they include - lower quality, no metal shoulder on the bolts. I was able to re-use all the original mounting hardware.

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2010 X5 3.5d: SOLD, but miss the torque...
2004 X5 4.4i: SOLD, but served us well