Ford 1997 Aerostar Manual page 148

Figure 6: Shoulder safety belt placement on the child
8. Insert either the left or right safety belt
tongue into the single opening of the crotch
belt buckle as shown in Figure 7. (It does
not matter which tongue is inserted first.)
Then insert the other tongue.
If both tongues do not latch in the buckle,
do not use the child seat. See your dealer
for repairs.
Figure 7: Fastening the crotch safety belt buckle
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