Hi Mic,
I’ve checked on two of my bikes with identical seat moldings and the same, black carriers:
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On my silver EVO the carrier stays in the position shown above, the distance of the two latches to each other will be ~ 30,6 mm.
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At my blue efneo the carrier falls down immediately, the latche’s distance is here ~ 31,4 mm.
…and there is one thing obvious - I can see the bolt in the gap between latch and seat molding!
Try to fiddle a washer between one latch and the seat molding and it will work just as you want.
Please do note that the word “tolerance” does not exist in Ming cycle’s vocabulary 
However - enjoy 