Thanks for the replies. I did some research once I removed my leaking heater core and discovered that it had the letters "KL" on it. It is a Number 20593 heater matrix sold by Foursome Vehicle Heaters. I emailed the company and found out that it is the same heater as used in the Lotus Elise Series 1, London Taxi TX1 and TX2. I can purchase a replacement from Foursome. In the meantime I have a rubber hose connecting the hoses.
