For the 1999 Buick LeSabre, the supplied fitment data lists a 9005 bulb for the high-beam headlight. No low-beam bulb is listed, so compare the installed bulb and headlamp assembly before ordering a replacement. The data does not identify a projector or non-projector headlight distinction.
Front turn signals and parking lights use 3057 bulbs. Daytime running lights and reverse lights use 3156. Rear turn signals use 3457, while the center stop light uses 1156. Tail-light listings include 194, 7441, and 3457, so match the bulb location and original bulb carefully. Front and rear side markers are listed as 194NA.
Interior fitment includes a 563 dome bulb, 212-2 map-light bulb, 211-2 trunk-light bulb, and 7065 vanity-light bulb. Courtesy and instrument bulbs have multiple compare-to-original options, including 168/917, 194/7441, 564, 2721, PC168, and PC195.