C-body ball joint identification

I bought this new lower ball joint at a swap meet a few years ago without a box. I think it is a '65-73 C-body ball joint. Has 5/8" threads and 65 near the grease fitting and 24-4001-026 on the steering arm. Here is picture of it with a typical B/E/late A ball joint below. What is the difference between a '65-73 Imperial ball joint and a '65-73 C-body ball joint?

I took a front end apart recently on a 69 Imperial that had the old BUDD disc brake system on it.
The lower ball joint is pressed into the lower control arm on a car like that.
But i'm not sure if early 70's Imperials would have a bolt on ball joint to the spindle like the big one that you pictured.

Thanks. As usual, there in no good info on the net about this kind of stuff.

thats a c body 65-73 lower ball joint excluding 65-8 budd disc

Thanks!!