You can use vinyl spray to match. One new can of black is included.
The color is rare, but the condition is even rarer. Almost impossible to find original covers in this condition. Don't like the green. You can spray them with spray-can dye from World Upholster to match your interior exactly. One can of black is included. If your seats are not black, you can use this can for coating other black vinyl items. Look at the condition of the stitching and padding on the back side.
1977 to 1980 W116 Vinyl Front Seat Lower Covers from Low Mileage Car
$98.00
SKU:
INT-116GRNSEATCOVERS 
Product Details
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$115.00
W116 Front VINYL Seat Lower Cushion Excellent - Used
Only fits seats with pleated MB tex (vinyl). Genuine leather covers use a different pad
Excellent used front-seat lower pad, as shown. This was removed from a 1979 300SD with only 130K ( front damage in an accident) and has been in dry storage for 15 years. Check the condition of the front edges and back side. There is no sagging in the padding.