I was surprised to discover that the flat adapter plate was steel, not alloy - it has been satin chromed.
Looks like the real deal. The copper wire is to retain the (loose) screws.
I'm familiar with those dommie manifolds Bob, the Model 7 dommies had them right from the start.
BUT, this one turned out to be a Triumph item. The E2913 number gives the game away,
and identifies it as off a 6T preunit Thunderbird. Its wider than the dommie one - and needs to be,
to reach the horizontal stud pattern of the later dommie heads.
6T manifold up top, dommie lower.