No tool came with my recently purchased 323 so I made my own.
Placed the 16mm bolt on the head of the wheel nut and gave it a tap with a hammer.
This left an imprint of the 17 splines on the end of the bolt.
Got my hand grinder and ran cuts up the thread using the imprints as a guide.
Once done tap it into the wheel nut and a socket/bar on the end and job done!!