Raynox MSN-202 and MSN-505 Macro Lenses

I buried this question in another thread which was a bad place for it, but has anyone here used either of these lenses underwater? I'm not sure I can squeeze these in my Gates HC7 with flat port - but would be interested to see if others have had any experience. The 202 is 25 Diopter. Here's a link to the Raynox page.