That's the twin Bofors. This is similarly scaled to the quad mount, and taken directly from a Friedman's drawing in US Cruisers (scaled appropriately, of course). In my mind it is perfectly adequate to represent the system and does not need reworking; if you guys want to do that, knock yourselves out, but I will not be replacing anything on my ships. I know what I'm doing.
The quad mount is somewhere in the USN Systems thread, even though the OP hasn't been updated in literally years it seems. Tim is too busy watching children's cartoons to get work done on it.