Do you still want a rubber foot? Not sure of the minimum quantity direct from 3M but this should (at a minimum) point you in the right direction because there’s a part number listed, etc.
3M™ Bumpon™ Protective Products SJ5008 Black, 3000 per case | 3M United Kingdom
Elektron may not even use a genuine 3M part but natehorn already confirmed the part is the same height (I think they use the same feet on all boxes but visually confirm first).
Don’t know if that helps but if you still need a foot, then here’s a leg to stand on 
: ducks tomatoes :
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