just for comparison's sake, potomac german has used axle shafts for say an '85 SD for $135.19 plus shipping. they seem to have
a decent reputation. don't know what year your car is, but it
might be worth a look: http://pgauto.com/

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rayroyw
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'85 380SE (238,300) my "new" old car!
'84 300D (303,000+)
'72 250/8 (mercy heaven)