It is on page 75.b (Boot/Trunk lid and equipment), item number 67.
As you noted many times, both SLS and Niemoller (at least, maybe others too) provide rather detailed and helpful schematics, with complementary information (one pretty good photos and descriptions, the other MB part numbers). The problem is classification of some of the items. In this case, you could search’rubber’ or ‘grommets’, trunk equipment, etc.