In Wrath of the Lich King it is item level 187, requires level 78 and sells to vendors for 9g 23s 68c. In MoP Classic it is item level 187, requires level 78 and sells to vendors for 9g 23s 68c.
Read from the World of Warcraft client build files.
How Standard Issue Legguards Compares
Who It Suits
Plate is the armor type Death Knight, Paladin and Warrior wear. With Strength or Intellect, Standard Issue Legguards suits Arms, Fury and Protection Warrior; Holy, Protection and Retribution Paladin; Blood, Frost and Unholy Death Knight.
Transmog Sets
Standard Issue Legguards is part of the transmog set Righteous Battleplate (Warrior, Paladin and Death Knight only). The other 16 pieces:
Blizzard numbers items as they are created, so the named items next to ID 44239 (44231 to 44244) were usually added in the same batch as Standard Issue Legguards: the same quest line, zone, vendor or reward set.
Reins of the Wooly MammothID 44231 · Miscellaneous · item level 10"Teaches you how to summon this mount."