I am pretty sure USE never made any production handlebars. They may have dabbled with the odd prototype but even then I'm just guessing. Contact Rory at USE to confirm.
The old bars were alloy... they came with predrilled bar end holes at each end, very narrow profile which needed a shim. Straight or a 3 degree bend only options, and usual plethora of anodised colours . About three width options, all of which would be described as narrow by today's standards.