Martin VDO Dotron Flange Bracket

Most VDO Dotron rigging hangs the dot off truss or off a Sceptron bar. The Flange Bracket is for the installed case instead: a mounting plate that fits the back of the fixture with the screws supplied and then bolts flat to whatever surface you have, through two 6.50 mm holes.

That makes it the part to specify when Dotrons are going onto a wall, a soffit, a plinth or a steel plate and are expected to stay there. It is sold per piece, so order one for each dot in the run. Martin lists it as P/N 91611803.