Festool489252 RTS 400 Replacement StickFix Pad, Soft, 80mm X 130mm (3 5/32 x 5 1/4 in)

what pad fits festool rs 400 eq?

Is this the origingal pad that came on the sander when it was new?

Difference between 489252 vs 490160 ? I have a 400 EQ +, the chart inside the box lists both pads, but can't figure out the difference.