Honestly it's about the simplest config you can do with a Cisco router. Mine are running voice so there are a bunch of VLAN statements that you don't need, or I'd copy them here.
If you have a TAC account you can ask them to send you sample configs, probably the easiest way.
One thing to check is if your provider is providing clocking for the circuit, or if you need to set one of your 1721s to do the clocking. If so the second one gets its clocking from the line.