I had these in both my '08 135i and now my '11 135i, I just put the ballasts inside/beneath the bulb and put the cover back over it, no problems. Had them ~10,000 miles no problems!
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2022 Tanz Blue M440i RWD Coupe - Soon™
2011 Crimson Red 135i - SOLD
2008 Jet Black 135i - SOLD
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