Trilux Fakes

I have my eye on a couple of Trilux S.U.I.T. sights on eBay and was wondering if there is anything to be aware of other than depleted Tritium vials. My concern is there may be AirSoft or other toy look-alikes out there posing as the real thing.
Thanks in advance!

Airsoft TRILUX Sights for SLRs/FN Rifles, to my knowledge have not been manufactured. They HAVE manufactured SUSAT Sights for the L85/ SA80's though. There are a number of differences, if you need to know?