If you want quality, ditch latches and go for an internal lock mechanism. Rather than an external hinged "flip", use a cabinet lock with an internal strike. Not all of these have to be key-activated, although most are also lockable.
Good luck! I got suggestions to try briefcase hardware, luggage hardware, this place, that place, the other place. I even tried the local band instrument fixer wizard. I didn't turn up anything even remotely close to what I needed.
I just got done fitting it up with latches similar to the ones you depicted. It was really quite involved switching it over to the new style hardware. I've posted about various aspects of the process at length. The result is not exactly stylish, but it ought to darn well keep the case closed through the years of abuse to follow. That's the main thing. (Outfitting my son for band next year. This is a trumpet case, incidentally.) I'd say the one up side is that the (similar to footlocker style) latches I used ought to do a much better job of staying shut through thick and thin than any original replacement hardware would have.
(One problem I always had in band was my flute case flying open at the worst times, like when I was ascending the granite stairs. That poor flute was in dismal condition by the end of my tour of duty in band.)
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