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Jack's replacement headlight bucket is plug and play for the first generation bikes, and utilizes an h4 bulb. Many of us have substituted Beamtech's LED h4 for the halogen h4 as it is brighter than the halogen and puts less demand on the charging system. This is the one I use, and it's plug and play. 9003 H4 HB2 CSP LED Headlight Bulbs CSP Chips 50W 6500K 8000LM High+Low Beam US | eBay Not sure if Jack's bucket has a rubber collar like the 2nd generation bucket has, but if so, that isn't used.
