Yes, you can install the SC Center Console in a 2005 EX. It has been done many times over. I have personally done the installation myself. if you do a search, you will find many tips and where to purchase parts. Most of the indviduals who installed the console, purchased them throught eBay. Good luck .
It has been done umpteen times by members here, however, it is not an inexpensive mod.
do a search and you can find plenty of threads on this subject, I seem to remeber one that had a parts list, install diagram, etc.
here is the biggest one:
Element Owners Club is your go to forum community to discuss your Honda Element, and get ideas from your next great trip to your next Honda Element Mod.