Why cant I find Antenna ring for immobiliser for Renault Clio 1999?

I have 1999 Renault Clio which died on 23rd Dec 2013 due to immobiliser fault. Renault cannot find one, I cannot find one on line. It has to be for the specific 1999 car. Apparently different from any other Clio's. My car has not done 55000 miles & am furious it looks as if I will have to scrap it. Please help