Full Bates Rig
The girth in picture is a “Full Bates rig”. This set up is used on Australian saddles when they are not fitted with a rigging dee. If your saddle has a billet strap between the top saddle flap and the under flap, this is the setup needed. The top strap replaces the standard overgirth, and the top strap is fitted with a dee one side and a roller system on the other side for additional ease of girthing. Highly recommended for Australian saddles.