This is a scrollbar master module because it help you build a scrollbar for K2 items like you want.
It support show scrollbar with One Row, One Column or Multi rows and Columns, is it amazing?

• If you show multi rows and columns you can config Columns number too.
• You can config width for each item.
• You can config width and height for scrollbar.
• This module support a lot of theme for scrollbar buttons (26 themes).
• You can set color for background, title, description.
• Special, this module auto resize scrollbar for every screen size(support desktop, tablet, mobile..).
• Select Resize Type: Select a Type to Resize Images (6 types, you can use ORIGINAL IMAGE type if want to show image not resized).

Module's Config: