I'm pretty sure I remember reading that they will. A speaker is a speaker as far as mounting. Before I put the BOOM speakers in my Ultra I read a lot of the threads to decide which speakers to put in, and there was a discussion about whether you needed the speakers to be waterproof or not... could you simply use auto speakers, etc. I do remember reading about a couple of members that said they used the marine grade speakers... however they said the speakers were expensive because of them being waterproof. Maybe do a forum search and see if you can call that discussion up.