Will work on the helix Jetta lights. Unsure on the gti.. don't know personally how close their reps for the gti are to OEM . These will not work on stock halogen lights, the adjusters are completely different.I may be asking what has been already asked but will these fit on the Helix Hid Reps for the Golf GTI? I know you said they will work for the jetta. Also is their a difference in the adjusters on the halogen lights and HID lights?