Hi I am new to this site and havehad 1958 and 1970 Cadillac. I am working on another older convertible and was looking for a good seat belt rig with a shoulder harness. The 98-03 Sevilles have the seat belts designed into the seats. Has anyone done a custom car with these seats? Does anyone know if the seat beltswork witha mechanical function or are they tied into the computer system. The size and shape are perfect and theleather patterncan beredoneto the pattern on my car. Thanks.