TrikerMimi
TOI - Illinois
Just brought home our '03 GL 1800! She has all the connections for headsets, but I don't know what to get or how complicated they are. Anyone have any help? Thanks! 
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The first thing you will have to do is determine what headset(s) fit your helmet(s)
I have a inexpensive Bell Shorty with I just installed the Elite 584 with the appropriate lower cord.
I have a very expensive full face Shoei RF 1100 which will not take the Elite headset so I had to install the Performance model.
J&M makes great head sets and their customer service is 2nd to none.
Before buying anything, I would check with them. Naturally I had to get two different types of lower cords as well, but what I have works well. Saturday, I was talking to a trucker who said he was well over a mile away. That is awesome.