Your new pitman arm have "RP" cast into it?

Rare parts shows 2 different arms for v8 cars
So does classic industries http://www.classicindustries.com/shop/1967/firebird/parts/steering/pitman-arms/

Not sure why Ames only lists one arm

I believe all these companies are reselling the Rare Parts pitman arms
I also think both these arms are built almost identical, so maybe that's why some businesses only list 1 v8 pitman arm.

Going to do some measurements tomorrow