Yes, it is possible to replace the lap belt in Vauxhall Zafira. This replacement can be done for safety purposes.
Its a lap belt.
Replace the belt with a new one.
Yes. If you have automatic seat belts be sure to your lap belt.
Lap and shoulder belt combinations in your car are called safety belts
twice as high
It should have the shoulder and seat belt.
47 inches
Yes.
Lap and Belt
40-50
Low on the hip
If your talking about the booster seat without a back then NO, It is not safe for the child to ride with only a lap belt.