2.4.3 Engineering contains a T6 level epic head that was orgininal added with black temple as a catch up item. Here is a picture that compare T4 Hunter head with the mail
Quad Deathblow X44 Goggles - Item - TBC Classic
Engineering Goggles Appearance Changes
Cogspinner Goggles - Wowpedia - Your wiki guide to the World of Warcraft
Shadow Goggles - Item - TBC Classic
TBC Beta - What we know so far - Warcraft Tavern
BIG Changes coming in live for Classic TBC! Enchanting, summons and engi goggles! - YouTube