Greg Bender
http://www.thisoldtractor.com/gtbender
Thanks to Bob Greene provided key starting information for these cross-references.
The physical dimensions of the swing arm bearings (MG# 92249216) are as follows:
Here are a couple of cross-references:
The following physical dimensions are slightly thicker, but work just fine and are much easier to source than the original (thanks to Fred on the Yahoo! Loopframe_Guzzi news group for confirming the fitment).
Cross-references for the slightly thicker swing arm bearings: