KOOTANS 1200Pcs Nitrile Rubber O Ring Kit 24 Sizes O Rings Assortment Kit Set Sealing Washer NBR Metric o-Ring Assortment for Plumbing, Gas, Automotive and Faucet Repair, Resist Oil and Heat O-Rings:
Metric O-Ring Groove Design Reference Guide
Performance Tool Metric O-Ring Assortment (419-Piece) W5203 - The Home Depot