HI KATE, I MAY BE ABLE TO HELP. I HAVE QUITE A LARGE SELECTION OF NEW AND USED BORGWARD ISABELLA. GOLIATH/HANSA 1100 & LLOYD PARTS WHICH I AM SELLING OFF. YOUR QUESTION THERE SHOULD BE A FLANGE ON THE TOP OF THE PIPE WHERE A EXHAUST RING FITS. I AM IN CHRISTCHURCH, NEW ZEALAND. HOPE THIS IS OF SOME HELP. DAVE