Most documents that have parts cross references are becoming woefully out of date.
The 'famous' NAPA - MB/GPW' pdf file has lots of errors and invalid part numbers.
SKF (or whatever the new company is) has an online tool for parts conversions to SKF products. Since they are one of the bigger fish, hopefully that will get you a part. One EXCELLENT part is that the spec sheets have dimensions.. well, at least for the seals I am looking up.
http://www2.chicago-rawhide.com/popup_p ... 457012.htm
Enjoy!