Washer Jet

Got donated a nice metal (chrome plated) washer jet, and as mine was plastic and broken tonight I changed it, the only issue is the hose is the wrong size, its too small to fit.. I need some of that HC tube stuff as fitted to the early HC’s ribbed and sometimes in a nice green tint, now where on earth will I find that ?

In the shed I fitted the flywheel and clutch to the 1057cc engine, the only jobs left on that are the head to refit when ever its ready at the machine shop (been waiting a bit but so what world isn’t going to end yet) a fuel pump, water pump and dizzy, then its finished and ready for a car.