Our #1999 bracket is based on the #21237 bracket originally made by the Adams & Westlake Co. for using hand lanterns such as the KERO as a marker lamp on interurbans and street cars. The #1999 bracket can be used with the Adlake Kero, #250, #300, and #400 lanterns, as well as the Dietz and W.T. Kirkman #999 Lanterns, or other railroad lanterns with a nominal 3 5/8" - 3 3/4" diameter body. Requires use with a marker lamp bracket. Will fit our #27, #28, and #33 brackets, as well as most American made Marker Lamp brackets, like the Adlake style #P232390.