9-3 locking wheel nuts

[thekirbyfake]

Our company pool car is in for a service and we can't find the locking wheel nut "key".

It's a 2001 (I think?) Saab 9-3 and the garage is quoting over £200 for a replacement which seems extortionate.

Where can I get hold of a cheap original Saab 9-3 "key"? Googling "Saab 9-3 locking wheel nuts" brings up several pages of £10-£20 options but will these actually unlock the one already fitted?

And no, I'm not a tea leaf trying to nick some Saab alloys. Honest