So wondering what other owners have done about this, as it's probably an issue with all child seats fitted to a Bongo? I could wrap the belt attached to the buckle around one of the bars under the seat to effectively shorten it, but this might cause other issues. Ideally I'd replace the buckle with a shorter one, maybe from another mazda, though don't know what would be suitable. The 626 or 323 one's look about the right length, but not sure if the buckle will fit the male clip on the belt. Anyone done this?Buckle crunch
Positioning the car’s seatbelt buckle hard up against the child seat frame can cause the buckle to fail under crash conditions.
Only the seat belt webbing should be in contact with the frame of the child car seat. If the buckle of the adult belt lies across the frame of the child seat, pressure on the buckle (in an accident, or even under sharp braking) could cause the buckle to fail. If it fails, the buckle is likely to open, allowing your baby or child to be projected out of the seat, completely unrestrained.
Cheers,
Alex