  The widths of a class of two-body $\bar{B}_s^0 $ decays induced by $b \to c
\bar u d$ and $b \to c \bar u s$ transitions are determined in a
model-independent way, using $SU(3)_F$ symmetry and existing information on
$\bar B \to D_{(s)} P$ and $\bar B \to D_{(s)} V$ decays, with $P$ and $V$ a
light pseudoscalar or vector meson. The results are relevant for the $B_s$
physics programmes at the hadron colliders and at the $e^+ e^-$ factories
running at the peak of $\Upsilon(5S)$.
