Can normal seat belts be used with buckets?

[Matt]

^^ that won't correctly hold you in an accident, with the raised sides of the buckets the seat belt will rest on these instead of your body. it will give you body an increased amount of movement, so the car will stop, with a normal seat you are held. and instead of you stoping with the car, with the bucket you will travel an extra 6 inches (for arguments sake) to then hit the seat belt and it will cause more damage then using harnessess