1967 Imperial Crown Sedan… need fuel sending unit

I have narrowed down my fuel gauge not working, to needing a new fuel sending unit.
I've searched the internet and found some but they specifically say" not for 67/68 Imperial".
what makes these models and years so special/different?
With all the knowledge on this forum, does anyone know where I can get one that will fit, perhaps from a more common C Body model?
Thanks.
Author: Cadee