Four-Speed Pedal question

there are heavy duty pedals and then there are pedals for an a-body.
the heavy duty has a pin that secures the over-center spring to the pedals and has a metal reinforcement around the spring.
the regular has a almost s-shaped thingamajig to hold the spring to the assembly. no metal reinforcement bolted to the pedal assembly
photos of my restored 1972 pedals by Passon Transmissions
have a spare HD pedal assembly if someone needs it.