Adapter: H4 Male > H13 Female GMC If in the rare case

If in the rare case something goes wrong

you can easily set them up in whatever shade of red

Designed to conquer compatibility concerns

Replace all together to save time and hassle

Adapter: H4 Male > H13 Female GMC If in the rare caseUseful: Sometimes "this" just doesn't plug into "that" When the industry standard for aftermarket lighting calls for mostly 9006 Female inputs, these adapters will come in handy. Go Direct: If your vehicle's stock headlight circuit is strong enough to power ballasts without a relay harness, these are the perfect solution for non 9006 headlight systems since almost all HID ballasts require a 9006 female input. Standard: These are standard equipment on