We unfortunately don’t have a product made specifically for the Soundman OKM ii.
However, i’ve just had a test with some of our small windjammers using a pair of inner ear headphones (iPod) put together to try and match the size of the OKM. (i’ve taken and attached a photo to show)
The one that fit best:
Description: Black Lavalier Windjammer - pair
Order Code: 065501
Web link: www.rycote.com/products/065501