K&B Bodies
This may or may not be a complete list; it contains the information I have been able to find.
If you have additional information and are willing to share it, please send me an email.

K&B started early and appears to have made three distinct series of bodies; the first in vacuum-formed clear plastic (the Model-Rama series) for scratch builders, the second in hard plastic for their Challenger series RTRs, and a third again in vacuum-formed clear plastic for their Mabuchi based RTRs. It is unknown whether there were more than two bodies in the third series, and whether any of the third series were available separately.
Here is an example (or three) of each series: