Locking wheel nuts

[Bananaman]

My 944S2 has 1 longer wheel nut on each wheel, i presume that these are supposed to lock in some way?
Is there some cover or insert that i'm missing & if so where can these be sourced?

Ta

[chris312]

My locking nut is hollow with a plastic locking sheath and cover that slides over the top. I'd guess you can buy new locking plastic covers from any car accessory shop.

[carl4x4]

those are the Porsche standard fit locking wheel nuts, look in your manual you'll see a picture of them. Not the best security feature I've ever seen, nothing that a quick tap with a chisel wouldn't bi-pass. better off buying some more modern ones imho