I'm using Mirka 90x90 interface pads, works well with both granat or abranet and easily available at least here in Finland:
http://www.mirka.com/es/product/#/8293012111/Pad Saver 90x90mm 12H,%201/Pack
http://www.mirka.com/es/product/#/8293012111/Pad Saver 90x90mm 12H,%201/Pack