Dell 0N399 - 4x Rubber Grommets Anti-Vibration Mount Screw for PC Case Fans - CPU Medics
What are these things called? Can I buy them on DigiKey? : r/pcmasterrace
High Quality PC Case Nonstandard Silicone Rubber Grommets-Open Grommets for Cable System - China Rubber Grommet, Oval Rubber Grommet | Made-in-China.com