Anything can be a scrollbar. Its just a matter of making sure it works!

since you used my base you know mine had a custom scrollbar. (Master Prestige icon)
Anyways here's all the materials of black ops 2. Just find one and try it.
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For the scroll bar to make it what you want here's the code
self.menu.scroller = self drawShader("rank_prestige11", 1, -500, 300, 18, (0, 1, 0), 1, 1);
No need to precache the shader. Just edit the rank_prestige11 to whatever you want but make sure the scroller in the hud matches your coding.