| hmm thats a tough one.  I can vouch from experience that with a Honda the regualtor / rectifier can be interchanged from one model to another fairly easily.  For example I use a 1000cc regulator / rectifier on a 600cc CBR motor.  Works just fine.  All it is in three yellow wires in, and then 12 volts out.  Pretty hard to mess up in a honda.
 Now in your case I'm not too sure.  I'd have to check the wiring harness and part for each bike.  And $120 for a used one is really high.  If I were you search for local bike salvage yards.  AJ Cycle salvage here in philly has sold me regulator / rectifiers for 20 bucks.
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