Teamco makes the sensor and the box says it's a unit that fits the Thunderbird 1956 Ford T10884B. Councours Auto Parts out of Nevada that sells old Ford parts says it fits the '56 Fords. Was the only year that had this sensor. '55's and '57's by their listings are different. That's evidently why the price is so high and they'er hard to find. Like I said the '57 is about less than $18 depending who you buy it from.