I currently have a 2007 997.1 Turbo, and was having problem with the low beam, and fog light fitment. I want to upgrade it to the HID for both. I got H8 and H9 for the low beam and fog light. However, the auto shop told me it doesn't fit. So I wonder which size I should get? Thanks and will be truly appreciated!!!

Sounds like you're not upgrading to HID but just to a whiter bulb - you already have HID, correct? The owner's manual has the bulb specs. If you have HID the additional high beam bulb is a H11. Low beam is the HID D2S