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I'm not a professional builder, but I would be slightly concerned about the torque stress of a 20 lb. weight held out at a distance along with the weight of the mount. I'm sure the prior advice to anchor into the brick is OK. Those look more akin to concrete block with a faux brick front. If it were me, I'd try to anchor at least the top anchors in one of the solid sections that go from front to back. It might take a little dective work and measuring to find those parts of the brick facing.
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Marv Evans
'69 911E
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