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LED H4 Bulb FXST ('03-on) Modification
Step 1: Due to the mount inside of FXST stock headlight
housing, our H4 bulb will not fit without modification.
Step 2: Remove bulb base from bulb as shown.
Step 3: The metal cooling fins on the bottom side of bulb need
to be ground down.
Step 4: As you grind cooling fins down, periodically dip only
the ground part into water to cool off.
Step 5: Grind cooling fins until they are flush with last fin on
each side as shown.