Update:
I've got it working with a single manila file modified. By pulling 1e29e8e7_manila from chuckz07 transparent slider (C07 Transparent Slider Only.cab) and installing it after installing the Mode9 Fix V3 I have a centered transparent slider on my Verizon OEM 6.5 SenseUI 2.1 upgraded TP2.
So, in short, install the Mode9 fix and then extract 1e29e8e7_manila from the attached cab (or just get the manila file that I've already extracted for you lazy people
)and copy it to your \Windows directory (do NOT install the cab, your icons will get all funky).