I rebuilt the 4 speed out of my 83 240D a couple years ago. This transmission was the aluminum one. The 716.210 I think. The part numbers for the synchros I used were 124-262-00-34 and 123-262-01-34

I'd verify the parts will fit your trans in an online EPC:

https://mercedes.7zap.com/en/eu/fg/car/240/240+d/222/123123/gm/716210/03g/26/0/545/0/0/#68

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Old Blue - 83 240D 6 speed manual trans, OM648
Green Machine - 2001 Europa G500
87 300SDL Bought on Peachparts. Low-ish miles..?

Family Truckster - 2012 VW Touareg TDI

Patchouli Wagon - 2004 E500 - SOLD
333k mile 97 BMW 750il V12. - SOLD
The Californian - 85 300TD - SOLD
Daily Super Sedan - 03 Audi S8 -SOLD