It depends on what specifically 'Freesoul' was looking for. Monovalves for the W124 series probably all use the same electric coil (the metal part). Differences from one model to another are usually in the plastic "plumbing" part of the monovalve. In the case of the W124.131 (E300D), the valve is a 2-way valve so there are more differences and that part is unique to that model, except (again) for the electric coil. SO it depends on exactly what Freesoul got at the junkyard.

The 124.030 (E320) has a very similar monovalve/pump combination -- I own one -- but it is not the correct replacement for the one in the 124.131. We need Freesoul to post a picture of his prize. The picture below shows the E320 and E300 monovalves. Notice the greater height of the E300 valve body, because it is a 2-way valve, and the extra "spigot."

Jeremy

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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