Starkey Products does offer a Dual Deutsch Connector H10 Adapter Harness that can be used to hook four D-series lights into your fog light wiring. However, tying four lights into your fog wiring would make your fog light system no longer street legal. Still, it is possible to do, and if you'd like a setup with all four D-Series lights tied into your fogs, just give us a call directly and we'll put together a custom package.