Pretty much any rusty-orange colored dry fly in size 6 or 8 will work. I prefer those that skate because of design or because they are tied to easioly accommodate a hitch. My favorite is either Bill McMillan's Stealhead Caddis in rusty orange or Harry Lemire's Grease Liner with a rusty orange body. A friend prefers an all rusty orange bomber and another friend prefers an orange stimulator. In other words, take your pick as long as it is rusty orange.