So when I bought my 05 OB it didn't come with any key fobs. So I've been searching to see what one I need. I found a 2 button one and a 3 button one. So do I need the 2 or the 3 button? Does the numbers on the back matter to what one I can pair with my car or not? The site I took the screenshots from don't have the 2 button one listed so I'm assuming that I need a 3 button. Noticed the Fcc numbers are different and so is the Pn. So thats why I'm asking before I waste money buying a key fob that won't work.