Hi, does anyone know how or where to find the roller fitted to the balcony sliding door of CC Phase 3,

?
My balcony sliding door is very hard to move, I checked and found that 3 out of 4 rollers (wheels) fitted to the bottom of door are cracked & need to be replaced.
After removed one roller (wheel), I can not find the brand, but only the number "60822". I have asked many people/shops at Tung Chung and Mong Kok for the part, still no a shop can trace one.
The door can not be installed now, pls help to give any clue, appreciated.