Where does this go?

[Colemanian]

I recently disassembled my steering stem to grease the bearings. I guess I wasn't paying enough attention. Where does this o-ring go? Can't remember if it goes under the white cap or on the bottom. Thanks.

Oh, 2011 300ec if it matters.

 

[GasGas]

It goes on the bottom. Just sits on the indent under the bearing if memory serves.

 

[Colemanian]

Thanks a bunch. It just didn't seem right but that's about the only spot it would go.