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Soni isn't going to answer.
But I referred him to this website https://www.tandemloc.com/ for all kinds of ISO container type items.
Not sure if that is the site he got them from, but this is a really good site to start with.
Normal ISO container locks have a lot of slop in them.
But, they do make ones built to have no slack.
Here is a vertical lock.
http://www.tandemloc.com/securing-vertical-clamp-conector-K08A00A-1GA.asp
And here is a stronger version of the same lock...