It's a little hard to tell without a closeup, but they look like they might be hoosier or icebox latches. There are all sorts of vintage ones for sale on ebay, but it might be difficult to get identical latches in the quantity you need.

Here is a link that might be useful: Hoosier cabinet latches

Try Cliffside for the latches. That's what mine are. Mine aren't icebox ones, but I think Cliffside makes them.