Lexus SC 430 2006 Owner's Manual page 84

1-7. Safety information
Installation with child restraint lower anchorages
70
Type A
Widen the gap between the seat
cushion and seatback slightly. Latch
the hooks of the lower straps onto the
anchorages.
Type B
Widen the gap between the seat
cushion and seatback slightly. Latch
the buckles onto the anchorages.