Shimano Shimano B01S Resin Disc Brake Pad and Spring, 4th version of B01S pad, fits many Deore, Alivio and Acera Calipers - Philbrick's Ski, Board, & Bike
Shimano B01S Resin Pads Bike Hydraulic Disc Brake Pads for M315 M355 M395 M465 Acera Alivio Original Bicycle B01S Brake Pad - AliExpress
New Shimano B01S Resin Disc Brake Pads For M315 M355 M395 M465 Acera Alivio | eBay