In The Burning Crusade it is item level 154 and requires level 70. In Wrath of the Lich King it is item level 154, requires level 70 and sells to vendors for 1c. In MoP Classic it is item level 154, requires level 70 and sells to vendors for 1c.
Read from the World of Warcraft client build files.
How Guardian's Plate Bracers Compares
Who It Suits
Plate is the armor type Death Knight, Paladin and Warrior wear. With Strength or Intellect, Guardian's Plate Bracers suits Arms, Fury and Protection Warrior; Holy, Protection and Retribution Paladin; Blood, Frost and Unholy Death Knight.
Similar Items
The 10 items nearest to Guardian's Plate Bracers (item level 33) in item level among Armor > Plate, Wrist slot, from item level 28 to 32.
Blizzard numbers items as they are created, so the named items next to ID 35176 (35171 to 35181) were usually added in the same batch as Guardian's Plate Bracers: the same quest line, zone, vendor or reward set.