Matt, that bearing is mounted in a rubber carrier, so there is some leeway in regards to side to side alignment. What usually happens when you are tightening the bolts is the clockwise motion of the capscrew will tend to move the carrier in the direction of rotation. (Same problem on BMW). Get some flat washers and put them between the lock washer and the slot in the carrier so that in the process of tightening, the carrier does not move. This is not a precision operation, but it should at least look symmetrical. There is, I believe a specification that suggests a gentle forward preload on the bearing (1/32 in or something like that). I'd have to look that one up. Will let you know. Otherwise get it a straight as you can.

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Jeff L
1987 300e
1989 300e
1987 BMW 325