https://www.ebay.com/sch/i.html?_nkw=3M+Quick+Change+Disc+Backup+Pad+Pack+Of+5+&_sacat=0&_dmd=2

3M Quick Change Disc Backup Pad (Pack Of 5)

Regular price
$175.00
Sale price
$117.00

Quick Change Disc Backup Pad, Vacuum Hole Design 8 Hole, Diameter 4 In, Face Mounting Type TR, Back Mounting Type Threaded Arbor Hole, Back Mounting Size 3/8 In-24, Max. Speed 15,000 rpm, Density Hard, Body Material Rubber, Package Quantity 5