I have heard nighmares about these locking nuts. Your right there are over 20 different combinations. I know two people who have had their bolts break when taking the wheel off. The metal parts that poke out the bolt aren't that strong and in some cases sheer. I have heard OPC's charging near on an hours labour to get the wheel off once the car has been rescued. Porsche now do a new bolt which is a one size fits all and is stronger. I paid about £60 for a set of four recently in my view money well spent.
I don't fancy being stranded
I don't fancy being stranded