I believe a number of the tool rolls supplied by the manufacturers were thin rexine type as its compact (triumph certainly) but they were too fragile to survive and became brittle so I have yet too find a surviving example after 12 years of searching.
The manufacturers tool roll contents were supplemented by both the riders and army .for examp!e adding a chain splitter ...
My suggestion would be to search for a small army tool roll on eBay and build your own kit up .the handbook should list the manufacturers issued tools and I am aware of photos on this forum and the web of tool kits
Jenkinov