I have not owned my 123 since new, but changed the flex disks at 125,000. The bolts in mine were installed just as they are in the pictured unit, in other words, half one way and half the other. They were installed this way on an earlier 123 I owned, and on the 116 I still own. Since I didn't any of own any of these vehicles since new, I cannot say if they came this way from the factory, but when I changed flex disks (and I did on each MB I owned) they were all installed the same way I found the original.

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Mike

2000 SL500 22,000 miles
1981 300CD 188,000 miles
1979 450 SEL 266,000 miles
2005 Cadillac CTS 25,000 miles