Rarest A-Body Option?

A38 equipped Darts and Valiants had the usual upgrade to electrics and suspension to make them suitable. One of the things added, which would have been a big assist to civilians, was a 7/8" REAR anti-sway bar.

The repair manual diagram I found showed the bar mounted to the body and connected to the rear axle at the shock plates via links like the front bar. Supposedly most of the A38s went to the Ventura Police Department. Anyone have any idea how many were A38 A-bodies were actually made with the rear bar?