In the roster in Narrow Gauge Pictorial vol.IV, the class V cars, 58328,58443,58424,58432,58445,58450,58433, all had KC systems. The others had KD systems.
The KD was a much simpler conversion, so all the cars that were converted back and forth from std gauge to narrow gauge in the mid to late 1940s, and 1950s were this type.