I just ordered this bearing from bearingsdirect.com (I think?) and it should be arriving within the next few days. Cost me about $19 + shipping, just under 30 bucks.

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08 W251 R350
97 W210 E320
91 W124 300E
86 W126 560SEL
85 W126 380SE Silver
85 W126 380SE Cranberry
79 W123 250
78 W123 280E
75 W114 280