Has anyone tried if the RODE Invisilav is compatible with the Sanken COS 11D?

I'm sorry, but what? That's like asking if a Sony camera is compatible with Canon camera. What are you asking?

It appears it may.. but without the specs, who knows.

ah, I get what you're asking now. What's wrong with transpore tape if you want it to be clear. If you want a mounting rubber then there are RM11.

I bought some to try out. The COS11 is a little bit loose but the real problem I had was I couldn't get the included double sided mounting tape to stick to it. I also tried cleaning the mount with Alco wipes before applying Topstick, but even gaff wouldn't stick. Maybe if I roughed up one side of it with fine sandpaper??

I use the Sanken RM11 with both Rode lavalier and Sanken cos11d mics. It seems much better designed than the invisilav... the vast majority of the time you are only using a single microphone so why use something larger than needed; the larger the profile the more likely you will get clothing rub.

I find that top-stick adheres well, but I prefer to use Joe's sticky stuff because it's easier to remove. I usually cover the whole thing with moleskin to further hold it in place, but still add the Joe's sticky stuff underneath in order to reduce rubbing against the skin.

We have limited access to moleskin here. Will check it out!