Mercedes in CONUS lists it as P.N. 140 274 01 15 $42.75 USD.

MBSpecialist in the Netherlands lists same part as 40.50 Euros
[Het grootste assortiment voor Mercedes!
Meer dan 550.000 onderdeelnummers!
Chassisnummer specifieke Web-catalogus
MBspecialist is een netwerk van Mercedes-specialisten]

(Part Number is from Army's listing of the RU catalog)

[I can't post pictures from my Screen Capture software anymore (????).]

But if you look at the RU ILCATS pictogram Army posted it looks
like there's a "Roll Pin" with an interference fit that secures the Gear.
Number 635 in the RU pictogram.(RU is calling it a "Clamping Sleeve".)

Mercedes in CONUS is calling it a "Roll Pin" # 001481003509 $1.20 USD
MBspecialist web site does not recognize the part (Yet)

I can't tell from ps2cho's picture.

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'84 300SD sold
124.128