H4 to 9004
This will allow you to install a 9004 bulb in place of your H4 bulb.
H4 socket plugs into your harness, 9004 sockets plug into 9004 bulb.
Made with 14 gauge SXL wire, terminals are crimped and soldered and loom is installed to protect the wires.
H4 is the same as 9003, 6014, 6006
H4 to 9004: $25.00 pair. (2 harnesses)