First off you have a Griswold which cannot be replaced as it is old and the company is long gone. To repair it so it is useable might cost a few bucks but I'm sure it's worth it. Inquire at large truck repair shops or search for someone that repairs cast iron engine blocks. this is usually only cost effecient on large diesel engines. The process requires the heating up of the piece, welding, and then the slow cool down process. The welding actually takes place in an oven which is then packed and seled and allowed to cool down very slowly. If you heat cast iron for a repair and allow it to cool too quickly it will crack.