H13 to H4
This will allow you to install a H4 bulb in place of your H13 bulb.
H13 socket plugs into your harness, H4 socket plugs into H4 bulb.
Made with 16 gauge SXL wire, terminals are crimped and soldered and loom is installed to protect the wires.
H13 to H4: $25.00 pair. (2 harnesses)