the link posted from ebay is not a genuine rs500 spoiler.

Tommen - over here the 2.0iS models had the longer spoiler that sits over the rear quarter panels (my dad had one when i was younger )

There are some spoilers that look the same but only cover the tailgate and not the quarters which look similar to the RS500 ones and also made of rubber. These were found on xr4x4's etc