Apply your 'nat inside' and 'nat outside' commands to your correct interfaces.
Build a pool and ACL similar to below. Make sure the mask you use is correct for your real servers network.
If you end up wanting to add more clients to this NAT rule, just increase your ACL and add the "overload" keyword to the "ip nat inside source list"
!Begin
!
ip nat pool POOL2NAT 192.168.254.55 192.168.254.55 netmask 255.255.255.0
ip nat inside source list MY-ACL pool POOL2NAT
!
ip access-list extended MY-ACL
permit ip host 172.16.2.2 host 10.16.16.16
!
!End