UMC6500ALF01 is 6500ALF01 and UMC6500ALF02 is 6500ALF02. UMC was used by vehicle manufacturer as identification code in part number to stand for Unity Manufactory Co. There is not alternative part number for these lights these part numbers refer to these specific lights. They are special lights for American LaFrance fire trucks. If you are looking for this style of light for a different vehicle these are 330 series spotlights. Specific part numbers would require the make, model and year of the vehicle.