Disco 2 wheel nuts

Hi Guys,
after your help my dad took the option of the free Disco 3 alloys. He bought the spigots off ebay and the wheels fit great, BUT the disco 2 lug nuts wont fit. i cant remember the exact sizes but his disco 2 nuts are to big for the disco 3 alloys. if he gets disco 3 nuts will the tread size and diameter be the same as his disco 2's or will he need to buy special custom nuts?
thanks again
Rob

Yes you need the disco 3 nuts the thread is the same. When you fit the spigot rings (if they are the aluminium ones) give them a coat of copper grease, it will stop them sticking if you need to change the wheels back. Also if it goes anywhere for work to be done make shure they are aware that they are fitted so they dont loose them.
Mark