C30 LAA 12 cab

[Pete Ashby]

Can any one shed any light on this question?
C30 12 cab LAA tractors are not listed as a type in the DND body parts list issued October 1941 revised January 1942.
I know the body type is 7D1 and was used on both 12 and 13 cabs, only being modified to take a spare wheel when R/F tyres were discontinued, but I mystified as to why it is not listed as a body type.

Anyone know why?

Pete