Are these the original locking wheel nuts as fitted by Renault? If so, I had exactly the same problem, drilling off four hardened wheel bolts with immaculate refurbed wheels wasn't really an option. I tracked down the original manufacturer of the locking bolts who were very helpful. There should be a three or four digit code on a document in the locking key plastic case....but I doubt you have that?? I had the case but no code. There are about 100 combinations for these locking bolts so in the end I had to drive to Milton Keynes to the manufacturers base where one of their guys went through their master set till he found the one that fitted. Took him about an hour and he let me have a whole new set and a spare key for £10. I was so thankful I gave him £20! Let me know if you want their details, it may be the only way. I combined it with a trip to the F1 test day at Silverstone so was a fruitful day all round