Are we talking about the same number here? The description sounds more like the cat production number... As far as I can remember, the engine number is stamped into the aluminum engine block at the drivers side. I looked for it last year and found it. It may be hard to read because of the aluminum "corrosion" of wear and heat. But it's there. I think I remember it to be close to the oil stick. Use a flashlight when looking for it. Look closely and you'll find it, a genuine Renault number. Best wishes Stian Birkeland Norway VIN # 06759