Tups Indispensible soft hackle

Hi all.  Anyone have a recipe for Tups Indispensible soft hackle with easy to find materials ?  All of the information I can find is outdated and have no idea where to find Tups fur as called for in the original tye.  Any help would be appreciated. Tying up an arsenal of soft hackles and found this in Sylvester Nemes book The Soft Hackled Fly and Tiny Soft hackles.