These are not protection of the seats attachment on the floor.
I checked 10 times under the seats and there is no place for them.
What G-Benz is saying may be correct.
I will see tomoroow.

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1989 230E, 8v, 166.000 km, updated to 94/95 trunk & hood
2002 Daewoo Nexia 50.000 km
Sold:
1987 VW Jetta GLE 16V, Recaro seats
1982 Volvo 240 DL (lovely car!)
and few more american cars.