Buick 1993 Skylark Owner's Manual page 53

To use a child restraint here, you will need a special
i
infant/child seat attaching belt and the hardware that
goes with it. See the earlier section about the top strap if
the child restraint has one.
Your
dealer can get these and install the hardware for
you. It's free. The special belt
is GM Part
Number
12340286. Your dealer can find the correct hardware
in
the accessory section of the GM Parts Catalog.