You WILL need the tail light extenders, othertawise, the bags, or luggage as they are referred to also, won't fit. The plus is, you won't hafta add extra wiring as the wires are made to "go the distance".......Lol
I've got the "extender brackets" for the GL650. Not sure if they'll fit the 500 right or not. If you find out that they do, I'll sell'em cheap. I need to get rid of some parts...