I wouldn't buy any electrical part used, but that's me.
You may be fine for a year or two, but it's still an electrical part that is @ 20 years old..."tail-light warranty". lol
My resistors may not be OEM, but they are certainly equivalent in quality and function.
I relocated them up and out of harm's way as well...the factory location sets them up for splashes and failure. (ergo...hot resistor + water from puddle = damage and ultimate failure)
To each his own.