After hours of searching I finally found out the part numbers myself
VGA PAD 12x12mm:
A-1857-843-A
CPU PAD 11x15mm:
A-1857-842-A
Now I know the size, but still not the tickness. And the original part numbers are noplace affordable.
Pictures are not available for relative measurement, either 
Is it possible for somebody to check out the thickness in a part-no-catalogue or sth.?
Thanks in advance