Those spouts are the ones I was referring to, the ones that are garbage. The most commonly available are Made in China and are an example of "cheap as they come" Chinese contracting.
Clamp SPOT WELDED to base plate--breaks as soon as you try to lock it down.
Spout SPOT WELDED to o-ring--leaks like a sieve.
Nozzle glued with very soft glue to spout--at 80*F you can pull it off with your bare hands. I wouldn't run fuel through this thing.
HOWEVER there is an upshot. Sometimes, you can find these garbage spouts for as little as three bucks. The tip of the nozzle is shaped for an unleaded tank screen (you know, the one it's illegal to remove, like we're gonna find leaded pump gas in the first place, much less want to run it), and the base of the nozzle is roughly the same size as the quality metal nozzles for the Blitz cans. It's close enough in size that if you prep the garbage nozzle (remove the screen that's just sorta pushed in there, get the gummy glue off) and the Blitz spout (break the surface), they can be TIGd together and you'll have an unleaded spout that fits your Blitz can.
The same can be done if you're able to source an original spout to fit those surplus cans...it's a leaded nozzle, but you don't even need to TIG it...JB Weld works fine as the nozzle of the original spout is slightly larger and can recess the garbage nozzle, just insert with JB Weld and then work the large nozzle around the smaller nozzle so it doesn't fall out. The JBW will seal it and the smaller radius (when you're finished) on the larger piece will ensure it doesn't wander off.
Pics of Blitz and NATO cans and modified nozzles:
http://www.tundrasolutions.com/photopost/showphoto.php/photo/34132/ppuser/5505
Tho if you can afford them, the Scepter stuff would be a better choice. It's similar in operation to the NATO cans but safer (maybe lighter, too, I don't know...I got these before I was aware of Scepter).
-Sean