Impressive! Never seen one actually fall apart, especially since the boot still had oil in it. Yes, you should replace the entire axle with a new or rebuilt one. I don't know what it would take to get an axle, which must weigh 20 kilos or so, shipped from the States. Rebuilt axles here are about 100 Euros for a good one. A new one from Mercedes is at least 500 Euros, maybe more, I don't have a good hack on your prices. Try to find a source in your country or at least in the EU for a rebuilt axle.

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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