I needed a replacement charger for the 5.2V, 1.35 Amp charger that shipped with my 2013 Nexus 7.  Unable to find one with these specs on line, including Google Play; I contacted Google support. I asked if I could use one of my 1 or 2 Amp chargers and they advised against it.  They could not help me locate an acceptable charger, but emailed tech support and advised that I would get a response in 24 to 48 hours.

After waiting 4 days, I contacted Asus support who advised that using a 1 or 2 Amp charger would not harm the device, although the charging time might change.   Hope this might help anyone in need of a additional or replacement charger for the 2013 7