For the 1998-2009 Nissan Frontier, the headlights originally used a replaceable HB1 (9007) halogen bulb inside a plastic housing with a clear lens, a design shared with the first-generation Xterra . While the earliest models (1998-2000) used a specific sealed-beam style housing, later models up to 2009 utilize a composite assembly, and all can be upgraded with modern LED bulbs or complete aftermarket replacements .