i have the same thing but its wrong as there was more than 500 made. It was classed as a special edition as Vauxhalls had a ton of bumpers and grills left so they got Irmscher to make sideskirts and a spoiler, Some shocks and springs off Bilstein and sold it as a run out model.
The 500 made is fiction even vauxhalls admit more where made as they had more than they thought
a few things with the add aswell, looks like a 4branch on there yet never thrashed or raced! I doubt hes not done it for a reason. Also £2k & its got 102k OTC! i wanted 2.3k min for mine with 4pots, over 20k LESS on the clock more mods & better condition FFS