The following is a copy out of the 2019-2020 MB Sprinter Upfitters Book. The foam pads are head protection. There were attached illustrations of the foam pads on the B pillars, but they would not copy.
Head Impact
Certain precautionary measures are necessary to ensure the safety of all passengers.
UPFITTER MANAGEMENT VANS offers two different solutions:
1.
Mercedes-Benz partition wall meeting the FMVSS 201 requirements.
2.
If there is no Mercedes-Benz partition wall installed, foam pads are provided in order to meet FMVSS 201.
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In the case you are installing an aftermarket partition wall, please ensure to meet FMVSS 201 requirements.
It is upfitter’s ultimate responsibility to review and comply with FMVSS 201 as it relates to its installation of Mercedes-Benz partition walls and foam pads, as well as its decision to use and install non-Mercedes-Benz partition walls and parts.
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If the vehicle has no partition wall installed and has a GVWR ≤ 10,000 lbs, it is fitted with foam pads (see pictures below)