LFR5201NPP 12mm ID x 10mm U Groove Track Roller Bearing Track: Deep Groove Ball Bearings: Amazon.com: Industrial & Scientific
DURA-LIFT Ultra-life max 2-in dual cage, sealed 6200ZZ bearing 10-Pack Gold Nylon Garage Door Roller in the Garage Door Parts & Hardware department at Lowes.com
DURA-LIFT Ultra-Seal 2 in. Nylon Garage Roller with Sealed 13-Ball Bearing and 4 in. Stem (10-Pack) DLRS13 - The Home Depot
Tapered Roller Bearings | The Timken Company
Track rollers, backup rollers and cam rollers | Schaeffler Group USA Inc.