Glad you found some that work. I can't wear ear buds in a helmet for several reasons:
1 - I've got weird/narrow ear canals and can never keep ear buds in my ears and when they fall out or partially come out, that drives me crazy!! Especially if I'm listening to something
2 - In the summer when riding in really hot weather/traffic, they make my ears sweat and sweat dripping down inside my ears is worse than having ear buds fall out.
3 - Better watch your state laws. In the People's Republik of Merry Land, it's illegal to have anything in both your ears while riding. One earbud is fine, speakers in the helmet are fine, but anything in both ears at the same time = illegal.