I replaced the axles on my wifes 123.

One is annular and one is homokenetic. The annular axle would not fit with the shim in place. (I couldn't get the clip on). Removing the shim and I could just barely clip the axle on.

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'84 300CD Turbo 132k (Anthracite Grey) - WVO - My daily driver - Recently named coo-coo-coupe by my daughter.
'84 300D Turbo 240k (Anthracite Grey) - Garage Queen
'83 300D Turbo 220k (Orient Red) - WVO - Wifes daily driver

I'm not a certified mechanic, but I did stay at a HolidayInn Express last night.