greg bender
http://www.thisoldtractor.com/gtbender
I extracted this information from Charlie Mullendore of Antietam Classic Cycle off of the Yahoo! Loopframe_Guzzi news group. In Charlie's own words:
The '73 Eldo ("Al's Eldo") that I recently worked on had a rear brake light switch that I couldn't identify. Now I see what it was from: Stoplamp switch for all Norton Commandos, Triumph and BSA triples and Triumph 750 twins. Exact replica of Lucas No. 34815. 05-01059. It mounted up using the stock holes and had spade terminals instead of those aggravating little screw terminals of the o.e. part. At USD $7.50 it's cheaper as well.