I have a 2015 S63, and under the floor of the trunk, is a seemingly random assortment of items I'm the foam tray, but it certainly appears that the items placed their by the factory are gone. I would like to replace them, only I do not know what it is I need to replace. Can anyone help me fill in the blanks?

 

Picture from my trunk, note that your car did not come with all the tools pictured.
The foam is standard but tools are according to model and market.
From my understanding for a 63 you should have the tirefit bottle, compressor, tow hook and wheel center removal tool.

 

thank you, i was able to order everything. the only items i couldn't identify is the little yellow thing to the right of the compressor and the big black round thing all the way on the left next to the compressor and tire sealant bottle that looks like it sits next to the foam tray

 

The black reservoir there is part of the ABC suspension system.
The small yellow item is a tire valve stem remover.

 

ah, thank you for all your help btw. ABC has an accumulator inside the trunk? or you just have a spare?

 

That's the actual part in service, a bit of a wierd location but I guess they ran out of space on the trunk wheel house and this was a low priority item since only a small percentage of cars would have it.