"Nut retainer" is the Mercedes term. Around here we call them speednuts. They the clips that contain the nut your seat mounting bolts, bolt into.
The nuts split off the retainer clips when I went to pull my front seat and I had to grind the nut heads off.
I need two of these, to do the front mounts of a front seat. Bonus if you have the bolts too.
Not sure what I am talking about? They are #86 in this diagram:
SEAT ADJUSTMENT W/HEIGHT ADJUSTMENT, FROM MODEL YEAR 9/79. Fits: 1980 Mercedes 300 TD Wagon | Mercedes-Benz of South Atlanta
I am in Canada.