Brake Pad Fitment

Nissin (2013 on rear, and 2013/2014 front)
J Juan (2014+ on rear, 2015+ on front)
Front pad shape FDB892
Rear pad shape FDB539

Past forum threads of highly varying quality / ability to clarify:

EBC
The EBC brake catalog covers Zero models.
However, it has always had the wrong shape recommendation for 2013-2014 models, and for the FX entirely! Double-check any recommendation.
Their Carbon X pads can eliminate front brake squeal. EBC Carbon X page
SBS
offers a brake search engine which covers Zero models.
Goldfren
offers a good cross reference between brands.
Brembo
Brembo's Motorcycle Brakes Configurator has reasonably usable Zero model lookup.
Their Carbon Ceramic pads are reported to resolve brake squeal issues.