Trying to install an infant seat into 97 960 Wagon - the "child" locks on all buckles seem to slip a little bit when pulled - is that normal? The forward facing seats seem to install fine, but I can easily wiggle the base of the infant seat out after I do my best to secure it in place. I would love to retrofit L.A.T.C.H. but it is apparently not available for that car. Does anyone know if something like self locking rear seat belts are available for the car (the ones that lock in when you pull the belt out completely...)?