Hi Geoff,
A common point of corrosion, but luckily Chris Witor has had these remanufactured for us in stainless steel.
https://www.chriswitor.com/
There are 'early' and 'late' versions. On one, the bend up toward the heater flow and return is in metal, the other in rubber hose, the metal work being a simple 'H'. The other ends of the 'H' connect to the water pump cover and the underside of the inlet manifold via rubber hose, but the pipes with the integral bends also have a direct union to the manifold. The cross piece in the 'H' part of the metal pipes is important, as it allows water flow to sustain via this as a by-pass when the heater is off.
Congratulations on your fine purchase!