I had to do this myself today so I thought I'd put together a little guide for anyone else needing to get the locking bolts off without the correct nut!
see : https://www.fiatforum.com/miscellaneous-guides/128372-removing-locking-bolt-without-locking-nut.html
see : https://www.fiatforum.com/miscellaneous-guides/128372-removing-locking-bolt-without-locking-nut.html