I tried gsxr's suggestion on my old 65 amp alternator... Take out the four bolts and it can be rotated and bolted back together in 90 degree increments! This is still no guarantee you can rotate the AL129X (I'm not about to pull it out again just to try!), but I'm willing to bet it works exactly the same way.

So all you people looking for a more powerful alternator for your 123's have nothing standing in your way! :-)

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'81 300TD Wagon 355k (Miss Diesel)
'83 300SD 180k
'84 500SEL 190k (Parting it out)