In this example, 088-100A-KIT fits a Land Cruiser built between 1963 and 9/73. The ending month/year means this part Fits vehicles up to but not including September 1973 or vehicles built between January 1, 1963 and August 31, 1973. The kit required for a 9/73 or September 1973 vehicle is 088-100B-KIT, which Fits 9/73-8/92 or vehicles built between September 1, 1973 and July 31, 1992. If the starting date or ending date is a 4-digit year instead of month/year, the part Fits the starting year, the ending year, and all months and years in between.