Reddit reviews BALITENSEN 2Pcs Smooth GT2 Idler Pulley 20 Teeth Bore 5mm Perlin Passive Pulley Toothless 20 Geer 2GT Idle Pulley for 10mm Wide Belt CNC 3D Printer
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The White parts are two nylon/derlin spacers. You can find these at homedepot locally but shouldn't need replacing.
Take it apart, turn the bearing, is it damaged or can you just oil it? If this doesnt fix it then either replace the bearing (long wait time from china) or buy the right size. It's more than likely a 10mm long GT2 smooth pulley
10mm Thick Version
https://www.amazon.com/BALITENSEN-Smooth-Passive-Toothless-Printer/dp/B079DMNDBQ
6mm Thick Version
https://www.amazon.com/dp/B071KK6Z8X/
Measure the thickness, and the bore size.