The original sideways vibrola is an utterly useless piece of junk - it has no redeeming features - starting with the rather obvious issue: IT DOESN'T WORK! Even Gibson themselves admitted this when they released their very ill advised reissue. Replacing it with a stoptail, or if you really must, a Bigsby is a very kind way to make an otherwise great guitar very happy. Mine got a Callaham ABR-1 and a Historic Aluminium tailpiece from a 59RI - amazing SG - sounds and feels wonderful. So, good work on a very wise decision!