I guess it depends on the price. the lenses and rubbers are hard enough to come by but I prefer at least the actual glasses. serialized frame, correct lenses and rubbers complete is a huge plus but not necessary. I would only consider a clone for around $300.
I have a never used pair, serial number IS 51 00353. Everything is tight and new as they have never been used. The only thing missing is the foam insert as it degraded over time and I just threw it away so as not to risk any residue damaging the sunglasses.