Number of wear indicators [per axle]: 2. OEM Numbers: 1763915--FORD, 1842632--FORD, 1916326--FORD, 2162266--FORD, 2221820--FORD, 2361234--FORD, BK212K021AA--FORD, JK212K021GA--FORD, 03H23D05--FORD, 1 763 915--FORD, 1 842 632--FORD, 1 916 326--FORD, 2 162 266--FORD, 2 221 820--FORD, BK21-2K021-AA--FORD, BK21-2K021-AB--FORD, BK21-2K021-AC--FORD, BK21-2KB021-AA--FORD, BK21-2KB021-AC--FORD, BK2J-2K021-AA--FORD, JK21-2K021-GA--FORD, KTJK21-2K021-GA--FORD, MEBK2J-2K021-AA--FORD.