In response to a recent inquiry, the correct replacement remote key fob for a 2005 Kia Amanti equipped with a factory keyless entry system is Remotes Unlimited part 593-1593. You can see and buy this keyfob at the following link:
2005 Kia Amanti Remote
The system in your vehicle requires a computer scan tool for programming to accept a new remote transmitter. So, you will have to take your vehicle and all of the remotes you use with the vehicle to a Kia dealership or qualified automotive locksmith for programming.
If you have any further questions, call Remotes Unlimited at 281-820-0300 (or toll-free in US at 877-719-1900) and choose option 2 to speak with a customer service representative.