Left rear view mirror has loosened. Fine around town, but around 60mph won't hold position. My mechanic tells me it's a rivet so it can't be tightened. Also told me to only get OEM, original equipment. That the aftermarket parts for this bike can be crap. Is it possible to buy one mirror or do I have to buy the set? Would someone in this group know of, or have one for sale? Thank-you in advance