The cover looks like "wire loom"...Electricians use it to install "knob and Tube" wiring in houses years ago. But I believe it is still stocked by a "few" electrical supply houses in the USA
Perhaps you could do a search for it and find some.
I found this fabric loom real quick. http://www.delcity.net/store/Loom-&...loom&mp_mt=p&gclid=CMbbn5XZlbICFUJx4Aod-1UAnA
