This Incoloy 800 heater element fits most 15" heaters, including Balboa, Thermcore, Gecko and many others. The terminals are 32 mm apart.
Total length: 245 mm
Maximum width: 38 mm
Depth, excluding the terminals: 38 mm
Between the heater terminals from center point: 32 mm
Between the right-hand terminal and the right end: 175 mm
Between the left-hand terminal and the left end: 32 mm
Therm Products : 25-4041BI