It'd be good to know the criteria for this aspect.
It might be that any car that was built in a production run where the battery may be mounted in the engine bay (why would they do this on any e34?) may have the link there. Early M50s and (some?) M20s have the battery there. '95 525IT (and others?), and all M60 e34s have the battery's under the seat and fusible links buried back under there with it...