D-ring on a belt at the side of the waist.....can be the same belt that weights are on, if you are carrying weights that way. The D-ring can even be a big fat O-ring. If you need an upper d-ring, one of these can be put almost anywhere. Removable Pin D-Ring Angled / Bent Version
The lower d-ring does not need to be on the BCD; it just needs to be in a convenient location, which will depend on YOUR size too.
The lower d-ring does not need to be on the BCD; it just needs to be in a convenient location, which will depend on YOUR size too.