My Mk3 Inter was with the Gloucester Shire and was repowered with an Isuzu diesel after the 1994 fire season when the NSWBFB had a crew or two burnt in petrol powered trucks. The mandate was that all operational trucks were to be diesel.
The original tray was mounted on a tripod arrangement to protect the bottom of the tank from flexing. All the red has gone these days its back to OD.