Focus on (vehicles) Fire Tender

I have a Cherilea Polizei Wasserwerfer (water cannon) like this, but the water cannon is missing - I reckon it's the same part as on the Cherilea Auxiliary Fire Engine. Any suggestions for a replacement or substitute? (Incidentally, the blue light is missing too, and I'd like to replace that, though I've found a good substitute in an LED light for RC cars, and this actually functions).

Those  bits are always missing along with the water pump !  (At least on the ones I’ve had Or seen ) shame as it’s a nice looking and unusual vehicle 

I love the fire tender, it's so odd looking and why I built the vambulance to match it.
Now have 3 tenders albeit 1 is a basket case