[PNJSNAK]

IMO
Are you using the solid aluminum bars or are you using the adjustable bars?
If you use the aluminum supplied bars the pan hard bar is not needed.
If you are using optional adjustable bars I would use the pan hard bar.

Let me tell you what happened to me.
I originally had the aluminum bars supplied with the kit. Drove the car hard for five years and then decided to put in the adjustable ones because I wanted to adjust the angle of the pumpkin.
Well, I took a corner real hard and broke the end of one of the bars and the rear end moved over. I fixed the broken end and repositioned the rear end and ordered a pan hard bar.
The idea of the panhard bar is to keep the rear end in a central position.
Therefore the position of the mount on the frame is critical to allow the rear to move up and down with any restriction.
I am not sure you can establish this point until the car is down on the ground and loaded.
I put the car on jack stands two up front on frame and two under the rear axle.
The took off the passenger tire determined best mounting position of the bracket.
Still drive the car hard on corners with no problems.
If A&C thought you shouldn't use a panhandler bar why would the offer it as an option.
I would call Joe T at A&C and ask him.
Jim