170-566 seems to have the early civilian type mudguards with the integral step (this type was used on '61 - '64 early aaco's... guards without the step were used on civilian units from '64 to '67). Maybe the original ones got damaged or were rusty or maybe it was a very early production model that used earlier guards. Of all pics i've seen so far all mk3, 4 and 5 have no step in the guards. Or maybe it was there because of the smaller wheels?
The truck in question looks pretty good as is ! Still looks very good as a tipper whether it's original or not.


Mousey