Originally Posted by
MLA
This sounds about right, but I cant say for sure, only a guestiment. The SX65M is the same as their automotive speaker, the SX65c, but with a grill mounted tweeter as opposed to the pole mounted on the "C". That manual is found with a google search and shows the grill to have a 6.7" OD, a 5.11 cutout. I would put mounting hole center to center somewhere around 6.2. Its not an overly heady speaker, so if the deck is thick and theres enough meat for the screws to bite, I think they would work, but I would still look at something better then just using the traditional wood screws. Backing plate, machine screws with nylock nuts and washers, etc. Having the mounting hole a snug fit to the basket helps support the weight. With an existing 6" hole, you dont have that advantage.