Mercedes-Benz E CLASS 2020 Operator's Manual page 122

120 Seats and stowing
Always install the floor mats securely
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and as prescribed in order to ensure
that there is always sufficient room for
the pedals.
Do not use loose floor mats and do not
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place floor mats on top of one another.
To install: press studs 1 onto holders 2.
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To remove: pull the floor mat off holders 2.
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