How do I set the refresh rate above 60, with Catalyst?

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http://askubuntu.com – I'm using ATI's Catalyst drivers for my ATI Radeon Mobility (5000 series) GPU in my laptop (the ones found in jockey). As I've got my laptop plugged into my desktop monitor (BenQ 1680x1050), I want to be able to set the screen's refresh rate to it's native rate of 75hz. Unfortunately, Catalyst only lets me set the monitor at a maximum of 60hz with no other options. How can I fix this? Thanks! EDIT 1: I have added the appropriate refresh rate using this helpful guide here, however Catalyst won't permit me changing the refresh rate to it (when I select the refresh rate in Catalyst, I get a (HowTos)