Slider "track" location/name

[Reasons]

I'm trying to modify a theme I downloaded and one of the things I don't like is that on the lock screen, it just has the slider but no track to pull it on. What image is this in the theme folder so that I can change it?

[maxlol]

File name:
bottombarbkgndlock.png
Location:
<root>\system\library\PrivateFrameworks\TelephonyU I.framework\


BTW i like being thanked for helping people