Hi, I trawled all over for the hose on the left, going into the air filter box, had no luck whatsoever so ended up making and mend with some modern hose. The one on the left, I have seen pictures of that hose been replaced by a modern equivalent, sort of 90 degree bend, in fact it was in that blue silicone hose, just a thought if you get stuck....🤷â€â™‚ï¸