I think the burners could be worth getting, although I don't know how difficult used ones are to find, or for that matter, stoves that they could be harvested from.
You could try offering $75 for both. The economics of supply & demand have to be considered with this sort of thing.
I used to switch on the 8" burner on my mom's '49 Westinghouse with bated breath every time. I had found spares for the 6" ones, but the nature of the beast suggests that fewer 8" sizes were produced.