Six pack throttle linkage help needed

[Conv440]

Piecing together a six pack package for the 71 RR 340 4 speed. I can't figure out how the throttle rods from the outboard carbs get connected to the center carb. Seems like I'm missing a part.
Also want to ask the purpose of these rods. I believe the outer carbs open from vacuum on the pods so are these rods to close the carbs on deceleration?

 

[Floyd]

You need this part

 

[Conv440]

Great, thanks! Does anyone know where to source one from?

 

[Floyd]

Just google “sixpack linkage”. Carried by multiple mopar vendors as a set. Maybe someone will sell just the parts you need. Check ebay as well.

 

[Strato58]

Ebay $29 I think