Ladderlock buckles?

[Dalton Masterson]

Howdy gents. Working on making a military replacement rifle sling, and need to find a ladderlock style buckle for 3/4" strap. 
This is a square or oval with a crossbar, and no tongue. I would prefer brass, but steel is fine too.
If you know of a source, please let me know. thanks.
Here is a link to a picture of the type, just not the right one.http://www.milwarehouse.com/bk501.JPG Picture from milwarehouse.com
http://www.mosinnagant.net/images/m27_rifle_slings.jpg Picture from MosinNagant.net

Addendum: I guess another word for them is slide buckle. I found 1 site with them, but they arent quite big enough.

[outrider]

Dalton:

Try the blockcade runner civil war sutler

[Dalton Masterson]

Didnt see any of what I needed at Blockade Runner, but now I think I want a wall tent, lol. Nice place there.
I did find a nice oval bridle buckle, and removed the tongue. It will work quite well I think. Thanks. DM