Clistview Styling Options? How To Get Last Item In Row?

I'm making a digital download management module / theme/ext marketplace. It's almost finished however I have some styling things to figure out.

I have a question on how i could get the last item in the row in clistview. Preferably I would like to get the last 5 items in a row so i can style the hover to go the other direction. Please see the attachment.

or the alternatively how could i get the row number.



Thank you!