Searching for a small 5vdc/230vac ssr, or a discrete circuit for same.

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Joined Dec 10, 2015
I built a project based around an arduino controlled fotek solid state relay, and hired a welder to have a case made from stainless steel. But when I received it back the case is 10 mm too small for the relay breadth, width and length are fine. I have sufficient length to fit a relay twice as long. I bought an omron mechanical relay rated at 10 amps but I don't think it will last as I need to run 2.5kw through it. So does anyone know anyone who makes a long relay or point me to a circuit to make my own. I don't need pwm or dimmer, simple on/ off is fine.
edit. the 2.5kw load is a water heater coil so entirely resistive.
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