Corepad Grips for SteelSeries Rival 600/650 - MaxGaming.com
Mouse Anti Slip Grip Tape for SteelSeries Sensei Ten Rival 650 Rival 600 Sweat Absorbing Grip Tape (Rival 650) : Amazon.ca: Electronics
Rival 600 Side-grips - My Grips Have Gone Loose... EDIT: (DON'T BUY, READ DESCRIPTION) - YouTube
Rival 600/650 Side Panels | SteelSeries
Not perfectly cut, but I finally replaced the stock silicone sidegrip! (Steelseries Rival 600 w/ Paracord, Hyperglides and GT-5000 Griptape) : r/MouseReview