In 1956 when I was able to rummage through the Ampico factory in East
Rochester, I found several boxes of roll tabs with D-rings.  The boxes
were marked "The Dennison Company" (maker of paper stick-on labels).

I am not sure of the address, or if that company is still in business,
but at the time I wrote to them and was able to purchase a couple of
boxes of roll tabs with D-rings.

Bruce Clark