The emblem already had the two sided tape on the back, all I added was plastic to plastic adehesive, made by 3M. Seriously, a gel type SUPER GLUE (ensure that it's heat/water resistant) will work perfect. Trust me, it would take an act of GOD to remove mine. I've already had it tested through a drenching rain storm, baking florida sun and a two hundred mile road trip and it's still just as secure as the day I put it on.
I was on Ebay about three weeks ago, and just happened to come across someone selling the R/T logo and the RAM Head logo. I haven't seen one posted on there since, but I'm sure they will start showing up again. I'd be willing to bet, you could get one from the dealer, but I couldn't tell you what they would charge. I paid $19.95 for mine.