Eureka! Timberline Annex
Here's what other sites are saying:
Timberline Annex Fly-The Annex provides 58 sq. ft. of covered space - perfect for storing gear that you don't want in the tent. Also makes a great cooking area in foul weather. Comes with one 59 in. three piece aluminum pole. The Annex can be used as a seperate fly without a tent. This set-up requires one additional pole (#21252). Made of 1.9 oz. coated taffeta nylon. 69 in. long and stores at 23 in. Wt. 2 lbs.