68-70 B body: What part is this called?

[RXTREME]

From youtube.

 

[kiwigtx]

Not the best of pictures to decipher what is there.

 

[detmatt1]

The part of the frame structure that ties the rear rails to the inner rocker and also where the front of the leaf spring is mounted iirc.

 

[kiwigtx]

Not the best of pictures to decipher what is there.

Now that I'm on my laptop, I see the door frame...I would say a brace for rear frame rail to inner sill.

 

[Matthew J]

AMD calls it a front leaf spring mount.