Toolbox lock circlip size

Quick question what size is the circlip that holds the toolbox lock in place on a GP?
The ability to post messages is restricted to LCGB members. Any questions contact us at lcgbadmin@googlemail.com
https://www.ilambretta.co.uk/forum/
https://www.ilambretta.co.uk/forum/viewtopic.php?f=10&t=6122