Sundance® Spas Systems used various Spa Transformers. The most widely used is the 6560-274. The reason we do not sell it with the connectors is that the configuration changed several times over the years. Where is the transformer? On many models, it was installed on the back side of the plywood that the System is mounted to. You will see 2 "white" molex plugs plugged into the circuit board and the lines feed out to the transformer.