Oh wait...my bad. I didn't read your first post carefully. You have an aftermarket HID kit now on yoru MS3 Sport correct? I assumed you had stock HIDs (via GT model).
Since you currently have an aftermarket HID kit, I believe you can just get the 8K or 10K bulbs and use it with your current kit. Shouldn't run into issues - can you contact the vendor your purchased the HID kit from and see if they sell the bulbs?