Most appropriate lock for side vender?

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I've been searching for locks to fit the side vender that is age appropriate. It's been harder than I thought it would be for two reasons: the hole is small, but the lip of the whole is wide.

The first picture is what I have on it now, but I'm afraid that's a die cast metal lock and not a genuine brass Yale.

The second picture is the lock that was on it, which is a modern lock.

What do other people have on their side venders?

-Dave M.