Not all that uncommon, so it should not be too hard to find another.
Further, if anything does go wrong, more often than not it will involve the engine, not the chassis, and that engine was very widely used between 74 and 79, most Victa's with a full crank engine, stater on top, and the G4 carby will be good sources of donor parts (older engines had metal carbies, and the next engine had the starter on the side, followed by the powertorque half crank engines
