I bought it off Amazon. You have to re-read the description; Spyder makes Halogen lamps only, and offers two models: one that plugs into Z4 halogen cars (non-M), and the other plugs into Z4 Xenon cars (M). With the M (HID) version, you tape/cover off the HID harness left-over in the car. The only difference between the two models that I am aware of in the harness size/shape.
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