1964 C10 parking brake question

[stanek]

I have a '64 short bed C10 with 11 inch drum brakes in the rear, and I am trying to install parking brakes. The original parking brake system was removed by someone long ago, including the arms inside the drum that the spring attaches to in order to put tension on the shoes to engage the brakes. I've not been able to find any. Does anyone know where I may be able to find the left and right parking brake lever arms that attach onto the drums to engage the parking brake? Is there a wide range of year models that may fit the '64? Thanks for any help.