How did you initially determine it was the fuel dampers? Did you actually touch each damper to ascertain if the noise you were hearing coincided with the vibration you were feeling? That is what is called out in the service manual.
I suggest picking-up an automotive stethoscope at any auto parts store and use it to pinpoint the ticking noise.
2005 SL AWD, Platinum
-OEM HID conversion & HID fogs
-OEM iPod interface
-Upgraded (non-Bose) speakers - Pioneer TS-A1702C & TS-G1643R
-Muth signal mirrors
-Valley Industries hitch and wiring harness
-Aluminum fuel tank shields