Sorry for the delayed response....CTDC has them. Last Time I ordered them I got a 5 pack from Amazon.
Try:
https://www.changingtimesdiaperco.com/c ... -fastenersor search Amazon for:
snappi cloth diaper size 2 fasteners
Contour diapers do not have the material where it is needed. Tried a couple of them years ago and they were not worth the bother with or without the booster. You might get other's input on the contours. For better or worse cloth diapers are about bulk.
Snappi #2 fasteners start at about 5-6 inches. I use large and xlarge prefolds on my 39 inch waist at night and snappis stretch enough to work out of the bag. Prefold sizing might seem large, but in the end it is fabric bulk that provides absorption. The fasteners stretch out over time. I have two that are over 12 inches long, still work fine and haven't broken.
Recommend you check the "New Diaper Primer". Hope this helps.