The ABEC 3 is probably better quality than the Align ones.
Most heli pilots get there replacement bearings from Bocca.
They even have a section specifically for each heli.
Heres the 500. Click on kit components to see the individual bearings. http://www.bocabearings.com/bearing-inv ... s-trex-500
GOBLIN 570------IKON WARP 360--------IKON QAV 500----------Open Pilot RCXH250---------Open Pilot