since the car has no back up lights, I think you would find it easier to just plug the hole with a metric plug.
Anyone with a metric tap/die set should have a little thread pitch gauge in their kit,,,,,or just try a few different metric bolts until you find the thread you need.
Oh, Renault tends to give their cars numbers/letters for ID, much like most other European manufacturers like,,,,,
Mercedes C230, e430, m320,
BMW M3, 740iL,
Citroen SM, DS,
Volvo 740,
Porsche 911, etc,,,
Renault does the same with models like the R12, R16 R21 etc.
The Renault "21 turbo" is actually a hot performing car, sort of like a "French"Ford Taurus SHO type of car.
They have tuners and a few enthusiasts who make powerful roadcars out of them.
Too bad the only thing that Renault has ever been really known for in the US is the "LeCar".
[ January 16, 2003: Message edited by: Alain Vanhollebeke ]