Has anyone seen an installation of a backup attitude indicator in an
older Cirrus without the PFD? Every panel I've seen has the same
layout, and there doesn't appear to be any extra space. It looks like
an HSI could be installed and the space for the CDI/Glideslope could
be used for an attitude indicator, but I haven't seen this done.

Thanks,
Eric Bartsch
1959 Pilatus P-3 A-848