Keeper's Warfists
Zealot’s/Keeper’s stat recipes was a special drop from the Marionette boss battle some months ago. You’ll need to purchase the specific Keeper’s Warfists recipe from the TP.
looks like the wiki is wrong in this case.
http://www.gw2spidy.com/item/49682
the recipe you’re looking for costs 50-200g on the TP
GW2Profits - a collection of gold-producing tools
Mystic’s Gold Profiting Guide
Forge & more JSON recipes
Mystic’s Gold Profiting Guide
Forge & more JSON recipes
search: “Recipe: keeper’s” in the TP window and check the box that says “Ascended” as the rarity and you will find all the keeper’s recipes
IIRC, you’ll also need to get a recipe for the insignia/inscription… whichever goes with the armor.