Here's the list of Mio Click Barriers:
www.coloplast.us/sensura-mio-click-baseplate-en-us.aspx#section=product-variants_4I use the 10502 Green size coupling, for stoma size 3/8" - 1 3/8". If you are able to use that small, go for it. Then you need pouches that fit the Green coupling.
The Coloplast people love sending samples! I get a message on my answering machine if they haven't heard from me after a couple months.