[C5GTO]

Given the angling of control arms on the CR1, the main lateral movement comes from control arm bushing displacement. If you have "solid" bushings, no or very little displacement. If you have rubber bushings, then there will be displacement under load. Under load is when you really don't want the displacement.

Is a Watts linkage better than a Panhard bar? Yes, but it's more complicated and thus likely more expensive.

Can a Panhard bar be setup to minimize the amount of arc? Yes, through length and setup. On mine, it's length it about that of the distance between the frame rails. For setup, it goes slightly downward from frame to rear end at normal ride height. So when the suspension compresses, the Panhard bar first goes to level and then to slightly upward. Given the amount of rear suspension travel on a CR1 (not a lot) and this setup, there's very little arc introduced by the Panhard bar. And besides, when you're cornering hard it's usually on a fairly flat surface, in other words not a surface with large undulations.

I didn't have a chance to jack up the car and take pictures over the weekend as I was busy welding new mufflers into the side pipes. Let me know if you really want some pictures and I'll try to find some time to take them.