I have a 2004 2dr Cavalier Sport. I'm very tall (6'7") and would like to move the front seat rails back about 4" to 6". I rarely ever have anybody sit in the rear seat so I have the extra room. I would also like the front seats further back from the dash to enhance the sound stage. Where can I buy seat rail extenders or does anybody have some instrutions on how to do this without rewelding new seat bolts?