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  1. MKIV Technical
    Hi Guys, I've currently got new series 2 headlights installed that are replacing the series 1s. In regards to the actual bulbs, I want to convert them to LED's however the HB3/HB4 part is confusing. Is series 1 strictly HB3 while Series 2 are strictly HB4 or are they interchangeable? Im...
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