just incase you were trying to save a bit of cash you can go with the dmt credit card size. Alot of folks will say that you should not be lapping your stones with it but I have done it with all my stones and it works just fine. I also use it as a slurry card and it works soooo much better than the naguras. You can find them here from a great Canadian vendor...
DMT Credit Card Sharpener - A.K.A Slurry card! it only costs about $15 bucks plus a bit for shipping. since your in Canada it wont be much. I look forward to reading your journal!!