I just went out to the stack of containers in my garage where I keep spare furs, etc fuming in Enoz. I brought a tape measure and checked the length of that nice white hair...inch and a half...dead on.
I also have some Coyote. The guard hairs are about 2 inches long and fairly light in color. There's a lot of underfur and other hair to pull out to get just the 2 inchers...don't lose that stuff, keep it for dubbing other flies.
Have you looked at mink or muskrat. Their guard hairs are about the length you're looking for (though they're tan to dark brown in color so they probably aren't good for dying...).