Sorry, I've only just got here
Do you mean crew lifebelts, which I believe were ready issued, or emergency life-rings?
If the latter, the old Anatomy of the Ship publication has a drawing of a open-fronted box mounting a single ring - the box is free standing on a deck edge, but the drawing doesn't show locations.
However... There is at least one Youtube video of the 1/10 model in the Kure Naval Museum, that does show life-rings
(I've been there - believe me, that model is LARGE)