Terry, it would be nice to know if they are still around. A Bing search didn’t turn them up for me.
On the thread I read on another site, the gentleman made masters off the Bachmann car itself, and then cast the extension parts from that. Maybe he also started up Nonesuch, I dunno.
Of course, we could draw up the parts and just have Mark print them out for us, but then the parts would need to be painted to match the car. Or the whole car would need a repaint once the part was installed.