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Looks (un)surprisingly similar to a Tektro 926AL 😉
Generally, you want to be looking for arms which are in the form of a C-Channel, like the Shimano ones or the higher end Tektro/TRP models. The cheap ones like the 926AL and similar can be found wanting in the torsional stiffness of the arm, which can lead to sponginess, poor modulation, chatter and all the other things we're trying to avoid by ditching cantilevers.
A quick look on eBay brought up some Campagnolo Mirage but no Shimano as mentioned above- anyone know anything about those?https://www.ebay.co.uk/itm/Campagnolo-Mirage-mini-V-brakes-/114648379947?_trksid=p2349624.m46890.l49292