uxcell Nitrile Rubber O-Rings 28mm OD 25mm ID 1.5mm Width, Metric Sealing Gasket, Pack of 10: Amazon.com: Industrial & Scientific
EC28x7 Nitrile Rubber End Cap Covers Seal 28mm Outside Diameter 7mm Width – AVX Seals Store
MAEDLER deep groove ball bearing single row inner diameter 15mm outer diameter 28mm width 7mm shielded on both sides SKU: 61902-ZZ-MAE - Maedler North America
28mm 5914-2RS Birdcage Bearing
Metric thrust washer inner diameter 28mm outer diameter 48mm width 1,5mm for shaft diameter 26mm SKU: 62422848 - Maedler North America
TW100SD-4 (PAIR) - 28mm Silk Dome Tweeter - PRV Audio