73 Duster collapsible steering column bushings

Hi,

I'm rebuilding the column on my '73 Duster, and in the course of my adventure, I managed to pull apart the 2 halves of the telescoping steering shaft. On the inner shaft, I found 2 broken "bushings" that ride in the 2 grooves near the end of the shaft. (see photo)

Any idea where I can find a replacement for these?

Thanks!
-Sean