Hi,
I’ll probably be embarrassed once I find out, but what are these parts? They came with my car but not on my car... Thanks in advance.

The first one is an aftermarket bolt on traction bar sometimes referred to as slapper bars. They help control wheel hop on hard launches. You must have a 68 or 9 because in 67 Pontiac had there own version of these. The second picture I have no clue.

Thanks. I actually have a 67 so good to know I don’t need to try and fit this on the car! Traction bar = radius arm, correct? Different terms for the same thing?
Thanks!