Locking Wheel nuts.

When to get locking wheel nuts for the 16" alloy wheels fitted with 225 75 16 tyres. I was suppled with 16 mm bolts. I came home to fit them and found all the same shape but 14mm studs are fitted. I took them back only to find that they are for 15" wheels. It would seem that Knaus fitted the Fiat Alloy wheels and it was suppled from fiat with 15" wheels. Or fitted fiat badges to alloys.

Part number. DIS 0050901523