I have purchased similar "workshop" locks for Fords in the past.
The lock barrel came with uncut tumblers and all that was needed was a good file and some elbow grease. Your key goes into the new barrel and the tumblers are ground level with the barrel.
Best done with a new key if you can get one.

I just got 2 spare keys made for 83 240D and they made me realize how worn my original key is!

My 240D was imported from the USA to Canada and the Canadian Mercedes dealers won't talk to me, since my car has a USA vin. I got a set from Romano Motors in Fayetville, NY. The parts guys were great! They spent a lot of time making sure I got the keys I needed.

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I choose to be happy, even when the Mercedes is being awkward, lol