Universal Caster Box,2 In., Includes 1" Crutch Tips, For Use With 20Z277, 4XM23, 5FYR3, 4XM24, 5FYP7, 3UY10, 4XM25, 5FYR4, 4XM26, 5FYP8, 3UY11, 4XM27, 6ZEY6, 4XM28, 3UY12, 4XM29, 5FYR5, 6ZEY7, 4XM30, 5FYP9, 3UY13, 4XM31, 5FYW4, 20Z421, 6ZEU1, 6ZEX9,...