Brake Pedal Switch Bracket

[R68GTO]

In the process of restoring my 4 speed pedal setup (using parts from 2 different used units), I noticed that the brake pedal switch brackets were different. One has a radius cutout, the other doesn't. Anyone know which one is correct? Or maybe one is an early version vs late version?

[Jims69z28]

I know this is a old thread ! Looking for a brake pedal bracket like one of these if someone has one they would like to sell ?

Thanks Jim