Yep, those seat front as standard issue Recaro seats. Not sure if the rear picnic tray(s) were standard or not, but with respect to the seats, I am sure you can find regular Recaro on ebay, especially since even then they didnt even attempt to match the rear seats in style at all.

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Mercedes Fleet:
2004 CL600 Designo Espresso SPORT
2004 S600 Designo Espresso SPORT/Lorinser Pkg.
1999 S320
1988 300TE
1972 280SEL 4.5
Diesel Fleet:
2014 GL350 Blutec
1987 300SDL Blk/Blk 4 place seating #18 head
1987 300SDL Smk Slv/Burgangy #17 head
1986 300SDL Blk Pearl/Palomino #14 head w/ 280K
1984 Lincoln Mark VII Fact BMW Turbo Diesel