Speedometer drive gear

[twintracks]

Hi All,
I'm attempting to repair the speedometer on my '56. Cable and drive are working. It appears that the drive gear has disintegrated. I'm not having much luck finding one, or even a photo of what it looks like.
Can anyone help with parts, guidance, or photos?

IMG_4003.jpg

Thanks, Jerry

[Mark Norris]

Is it the same unit as a '56 Thunderbird ?, one on sale on Ebay;

https://www.ebay.com/itm/1955-1956-T...oAAOSwNvBee9qd

Looks like the driven gear is sacrificial nylon;

https://www.ecklers.com/1955-1956-fo...6-27035-1.html

Here is a Mercury version for '56;

https://www.ebay.com/itm/NOS-1956-Me...UAAOSw2tFebzjj

Mac's have a whole range of white unit ratios;

https://www.macsautoparts.com/ford_m...d-sensors.html

..the question is which one is right for a Mkii?