All righty, yes, pulling the bezel gets me access -- but you folks knew that already. But that exposed another question: the vinyl courses are so tight to the block that I can't get at the fasteners for the block.
I'd prefer to not cut the face of cover, but rather, remove it, mount wood behind it, replace the cover, mount the speakers.
I presume I need to release some of the vinyl courses enough so I can get at the block fasteners. I know vinyl siding has some funky tools -- which do you think I'd need for this?