I was looking at the fender, under the rear seatpad, and noticed what appears to be a heat sink of some sort there...I didn't have time to take everything off and try to identify it, but can anyone tell me what that goes to?  I was going to put my saddlebags on the bike, they're the laceup style, but I don't want to do that if they're going to be cutting off all air to that heatsink, if that's what it is.

I tried to remove the rectifier when we had the fender repainted on our '86 and that sucker was screwed down tight.  After seeing how expensive they are to replace I didn't want to take a chance messing it up and just left it on.  The shop taped it off real good during the paint job and everything turned out nice.  I now have an impact driver and maybe that would help, but penetrating oil and a screwdriver wouldn't budge it.