My bike, a Kona Jake the Snake 2010 has Kore Race cantilever brakes and needs replacement pads. I'm considering Koolstops but which ones?

My existing pads are as per the attached photos so I'm guessing that Koolstop Supras will do the job?



The stem on the existing pad is centred whereas the Supras are not - are pads with non-centred stems suitable for use with my Kore Race cantis?