Since junkyard cars tend to be wet (and you'll never get the mildew stink out out of the foam), check the parts section of this forum for someone parting a car like yours. The foam pieces under the carpet is not a big-demand item; you should be able to get what you need inexpensively. The carpet itself will be a little more work since you will want to match the color but again you should be able to find it used. Worst case, you can have carpet made to fit.

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"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970