I doubt you'll find any.
14mm nipples are favored by production wheel builders because they make lacing faster. The benefit is the longer thread that allows lacing to be finished while the spokes are all very slack. So a 14mm with short threads nipple is self defeating.
The 12mm nipples I'm using now are from a large purchase from Alpina some years ago.
But that begs the question of why you need those specific nipples.
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