http://flyfishingnetwork.com/FlyBuy/...rnsPiping.html
I found it in this Pennsylvania site . It is a little hard to get around in. While it is listed on this page you can not buy it directly.
Go to flyfishingnetwork.com click on flybuy in middle of left column select fly tying materials select yarns and piping. A search window will come up on the right side of the window select exact match, and type in canadian mohair, a shopping cart will pop up with a box to write in your color selection spectrumized brown.
I don't known these people If it were me I try and find a number to call them if possible
Good luck
Ps I read on a forum these guys are suppose to have it.
Lakestream Outfitters
334 Central Ave
Whitefish, Mt 59937
Phone 406-862-1298