MT WTB: Dana 60 12" drum brake part needed

[B. W.]

Hey guys, I have a 71 GMC 3/4 ton 4x4 with the Dana 60 "one year only" 12" drum brake setup ( I believe it was one year only, I'm sure the more knowledgeable members will correct me if not). I need the passenger side parking brake strut. It measures 7.75" in length, the picture shows both sides for reference, the one I need has one broken tab on the end. I'm not sure if the 11" or 13" parts are the same. Also, any additional info / part numbers / interchange data would be nice. (The bottom picture is the driver's side, it shows the location of the part) Thanks for looking.

Bobby