TRACKBAR, anyone here run one?

With proper load spreading plates I see no reason why a panhard bar would accelerate the demise of the car. It will need a strut from the frame anchor to the opposite side of the car.

The locator should be made as long as is practical. On my '65 that is roughly 32"-33" long. With 2.5" of up travel in the suspension (more than I actually have) and the bar parallel to the ground the lateral dislocation is less than 1/8"
If the bar at ride height is 1" lower at the axle end than the frame end that dislocation drops to under 0.04"