The interface that HTC puts on the TP2 on top of Windows Mobile is commonly known as "manila"

Manila comes in 2 different flavors.  There is TouchFlo 3D (TF3D) and Sense User Interface (SenseUI).

If your slider looks like this: then you have TF3D.

If your slider looks like this: then you have SenseUI.

Neither SenseUI nor TF3D are OS dependent, meaning you can have SenseUI with Windows Mobile 6.1 (WinMo61)and TF3D with Windows Mobile 6.5 (WinMo65) or vice versa. You cannot switch from one to the other without changing ROM's on your phone.  In addition to this, both TF3D and SenseUI comes in different versions. The sliders here are for versions 2.1 ONLY of TF3D and SenseUI. Other modifications are available for versions 2.1 and 2.5 of SenseUI

Are you looking for a stock slider? Click HERE.

For custom SenseUI slider icon sets

click HERE

For custom TF3D slider icon sets

click HERE

For other Touch Pro 2 customizations

click HERE