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How comfortable are you with soldering?
If very, then I'd get the same little 5A blue relay and a board - the one I got was called a "dual mini board", it was about 3" x 1.5" and could be snapped in two. Each hole has a little copper around it but nothing is connected. You just stick the relay through the holes, solder from the backside, and then it's easy to solder stuff to it from there.
If not, I'd just get the 30A auto relay that they sell. It will probably work with that button.
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