How would I find these OLSA/Carello numbers for the reflectors?

I have one on the the car and the numbers on the actual reflector (top of reflector) are: 91.017.718 9030 (I have also found the 91.017.718 referenced out there on the web as this reflector). Turns out that they stopped making these about 6 months ago and that they were on a variey of models including all the 1999 Diablo's...