I assume you´re looking for a german or spanish ammunition pouch used on the Sandtroopers also IIRC. Antique Black Leather Pouch
They pop up on the Ebay from time to time, just keep your eyes open...
I might have some of those left but shipping overseas (from Germany) costs almost the same than the pouch plus shipping on the Evilbay....
Try searching for "ammo pouch", "ammunition pouch" or "cartridge pouch"...
At the moment, as it is difficult to find one of these pouches decided to arm them from taking measures I got the original one on ebay a bit battered.
Here the work and result:
Aging a little and harden the leather and would be completed.
Some suggestions are appreciated.