A small update. I've just ordered a Cusco BMC stopper from Car Mods Australia. Will post pics when it arrives and is installed.

Also JeStEr, I won't be needing your knob anymore. I just ended up peeling the skin back off mine and rubbing some alcohol on it to get rid of the sticky stuff and make it all shiny.

Worked a treat and looks fine now.

Still need to order those STI pedals though.