I think the Yellow car was it's own car, Specially built for it's purpose. It has 4 pins across the front, The Rod Shop car has 3. The RS car has round tube pedals, the Yellow car has square sheet pedals. The Yellow car has neat pedal travel holes, the RS car has hacked holes. The interior tin work is different between the two and the Yellow car had the data recording equipment in the trunk.

I think the Blue/Black 3263 B/A car is the RS car. Alot more similarities between the two.