If you can't find the proper color just use a Grizzly and Brown hackle mixed. It will get you close enough so the fish do not care. The one hackle that is still (In my Book) missing is the good hackle long enough to tie size 4's 6's and 8 dry flies. Such and Salmon Wulfs and Varents. It is still hard to come by. I have orders here and I am waiting tying to find hackle for them as I write this. I ordered from two companys and nither one had hackle that I felt was worth the money. Just not stiff enough in my book. But I will admit I am a little picky.
In a letter from Art Flick I have he said about the same thing. He felt that the larger hackle for is varients was real hard to come by. He told me he always had an eye out for it. Still that way today. Ron