Use hose off the roll. The chances of you finding the OEM carb coolant recirculation lines are pretty slim (hose off the roll will be cheaper anyway...) I have used heater hoses from other cars to make it all work. I took the hoses I had into a parts store and compared them to what was jammed in their racks. One hose was definitely off a late 80's Nissan Pulsar - I had to cut it down but it fitted perfectly once I lopped off the superfluous end. I should've written down what the donor for the 'S' hose was. I probably did enter it on a post but it would take me centuries to find it