I believe this is the one you need, check dims in pic.
No name reamer from my toolbox and never used it, I had to send the head out to be remachined and they removed a stuck GP.
I had a shorter one I loaned out and it never was returned
If its the one you need contact me!
DDH

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'95 E320 Wagon my favorite road car. '99 E300D wolf in sheeps body. '87 300D w/ Sportline suspension. No more '79 300TD w/ 617.952 engine at 367,750, it was my annual driver to Texas and I sure don't miss it poor A/C heater system!