There are two different piston sizes for the W123, 240D. They made them a little smaller, .10mm as I remember, starting about 1980. Do you have a manual, Haynes is OK and cheap on eBay, or the online manual.

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1985 Euro 240D 5 spd 140K
1979 240D 5 spd, 40K on engine rebuild
1994 Dodge/Cummins, 5 spd, 121K
1964 Allice Chalmers D15 tractor
2014 Kubota L3800 tractor
1964 VW bug

"Lifes too short to drive a boring car"