This is from the old Airfix Refueling set. Between this model, with has the twin axel in the rear and the earlier Airfix Matador with the 5.5" gun, which has a single axel, you have all sorts of possibilities for conversions. This one, however, is pretty much OOTB. I did replace the rear doors out of sheet plastic as the kit ones would have looked out of armor plate. I also "busied up" the pumping equipment as that supplied with the kit is a little sparse. Only other additions are headlights, which the kit omits, and glazing for the windows.