My 1969 350 firebird conv. had the "shorting bar" and it caused a fire.
I replaced it with a 40 amp circuit breaker.- the silver looking thing shown in a previous post
The 40 amp breaker was standard on high option fb's with lots of accessories, and bigger pontiacs.

Replace it ASAP. Any short from the switch back to the top pump will cause a fires.

Also there are two kind of circuit breakers an inny and an outty.
you want the one where connectors point out