Mine sits over top the factory setup. Unscrew and put it right over with the torx screws that came with my set up. My only issue was the cap was abit too large so i replaced that so that i could actually lock it without turning the the cap in the right spot to close the lid. Also, winter sucks for actually locking the lid so i leave mine unlocked just for winter. The brand was rugged ridge billet style locking gas lid/cover.