Finally went to Casio Service Centre at Segambut to order the parts for few of my G-Shock and finally get a clarification of their policy on parts ordering...
Hope this post will serve as a guide to those who's curious on the process to order parts
for your G-Shock:
1. You can only order the parts for the watch that you owned (the model specifically...), meaning if you own a black Rangeman, you can't order parts for a green Rangeman.
2. Waiting time for the parts will be >3 months
3. Full payment is required upon ordering.
4. If you have more than one watch that requires parts, you will need to leave you watch there with them during the order waiting period (>3 months)
5. If there's no damage to you watch, they WILL NOT order the part for you.
Bro
Everdying, I asked about ordering the resin band for the G-Steel but the Malay lady there die die also don't allow me to order

saying only can order the stainless steel band :sob: