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I was wondering if there was an opposite brick to this one:
Basically, I am looking for a 1 x 2 brick with two holes on the side where I could join the brick mentioned above.
Your best chances are with Technic, Brick 1 x 2 with Holes. Although LEGO considers such connection illegal depending on application (see slides 2, 11 and 12 of this presentation by Jamie Berard). However it works without major issues.
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