They did try to keep parts commonality as high as possible but they did en up making full turrets, base ring mounts and pedestal mounts, fully enclosed, open backed, open topped, twin and single mounts and all of them came with a variety of armour and came in different sub models.
You're absolutely right.
Maybe I was originally thinking about the Mk 37 director since this was originally about the Yukikaze's fire director? Then again those had some variants too with the different radars didn't they?
Yeah not really sure what the hell I was thinking.