1963 Plymouth Valiant Convertible Signet 200

Help us !! Last fall when we put our car to bed the rear window regulator broke. We have looked everywhere for a replacement for it. It is the rear passengers side we need but could use all. We have found that because it is a convertible it is a special part. We don't know if any other year will fit. If anyone of the A-body family can help us we would be so appreciative. We are searching for chrome parts, arm rests in good condition and anything else we can find.