This is a NEW neutral safety and backup light switch which was used on all 1955 thru 1957 Thunderbirds which had an automatic transmission.  The switch mounts on the underside of the automatic shifter as shown in the last photo (part # 15812). Perfect for replacing a missing or defective switch.  See my eBay Store for more Ford and Thunderbird parts including the shifter bracket which this switch mounts to.