I bought my truck used, and it came with two keys, but only one key fob. Just the other day, I stumbled on this ebay store, keylessremotesforless.com I got an extra factory key fob shipped for under $20 and the instructions to program it were spot on! Just incase anyone else is looking for a spare, or just want a new one. I did not know that you could program up to 4 fobs for your truck!

 

For more info, click my signature link, scroll to the bottom of the album list, & then read the TSB about the RKE system.