Check your current bearings. They may be fine (all rollers shiny) and just need a grease re-pack. The W123 cars used the same bearings as a Chevy truck, so are beefy. But, I did find a pitted one in my 1984 (cone only, race was still shiny so left it). I always used quality grease, like Moly and insure marked "for disk brakes". Pack it from the end by hand until it squeezes thru all the rollers. BTW, I found the "fits Chevy" thing when I got a Made in Germany bearing in a thrift store bag of assorted auto parts for $3. Looked it up and sold it on ebay for $5. Later, I found it fit my W123 (kicked myself).

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1984 & 1985 CA 300D's
1964 & 65 Mopar's - Valiant, Dart, Newport
1996 & 2002 Chrysler minivans