So there is no way of knowing the difference because they are exactly the same? Same diameter, no markings, same everything? So the person selling the hondaline OEM saddlebag rails for $650 could very well be selling $400 ebay ones?
It is pretty well as you say. A few of the aftermarket rails don't fit well at the back but they can be made to work. You really can't tell until you try them.
The OEM rails have small white teflon plugs in small holes on the upper shock mounts. The aftermarket ones do not. That is the only way to tell if I remember correctly.
I have an OEM set that are scratched on the bottom side where you cannot see it unless you are laying down under the bike.
Hay

Jimmyt