American LaFrance ALF Eagle headlight bulbs utilize H4651 size for high beam and H4656 or H4652 sizes for low beam applications. The replacement chart contains bulb size specifications across vehicle production years spanning 1997 to 2012.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The American LaFrance ALF Eagle uses H4651, H4652, and H4656 bulb types across its headlight positions. All three are ANSI-standardized sealed beam units used in the United States and Canada, operating at 12 volts.
All three bulb types share a 4x6-inch rectangular sealed beam format. In this design, the lens, reflector, and filament are fused into a single glass unit, meaning the entire assembly is replaced rather than an internal bulb component.
The H4651 is the sole bulb type specified for the high beam headlight position across all model years from 1997 to 2012, with 2009, 2010, and 2011 not represented in the specifications.
The low beam headlight position uses either H4656 or H4652 depending on the model year. The H4652 is described as a variant of the H4651, and the two are not interchangeable with H4656 without confirming fitment for the specific year.
For the ALF Eagle low beam, H4656 is specified for 1999-2001, 2005-2007, and 2012. H4652 is specified for 1997-1998, 2002-2004, and 2008.
Because H4652 and H4656 occupy the same physical 4x6-inch sealed beam format but are distinct ANSI types with different beam patterns, substituting one for the other in the low beam position would not conform to the year-specific fitment data provided.