Later Spridgets used a crossflow radiator. Sometimes, we see these radiators on Bugeyes as well.
If you want to upgrade your system, an aluminum core is the best way to the improved cooling.
If you have a Bugeye or early Spridget, you will need out down flow aluminum radiator. If you have a cross flow, this is the radiator you need. If you are unclear, which radiator you have or need, please call.