This topic is about finding the right convex wafers for stomas that measure 7/8" and 1/2". The person is looking for wafers that can be customized to fit these specific sizes, as the samples they received were too large. They also need contact information for Coloplast in the United States. Here are some helpful tips and advice:

1. It's a good idea to talk to your stoma nurse. Convex two-piece systems can help prevent leaks, but they might grip tightly and could cause blistering or bleeding when removed.

2. Hollister Moderma Flex convex pouches are available in a cut-to-fit option, which allows you to customize the openings yourself.

3. Coloplast offers a convex two-piece wafer, part #12716, which can be paired with the non-drainable vented pouch, part #12355. You can reach Coloplast's U.S. headquarters at 1-800-533-0464. Many users find Coloplast convex wafers more comfortable and less irritating to the skin compared to flat barriers.

4. In the UK, NovaLife convex appliances can be either factory-cut or self-cut. They also offer mini pouches for activities like sunbathing. You can contact them at 0800 378 846 in West Sussex, UK.

5. ConvaTec does offer cut-to-fit convex flanges. One user mentioned cutting a 1 3/4" wafer down to 1 1/8". You can call ConvaTec for advice from company nurses on sizes smaller than 1".

6. Using barrier (stoma) rings that fit snugly around each stoma can allow you to use a slightly larger convex flange, such as a 1" one, without exposing the skin, even for a 1/2" stoma.