Is this a 390? It is 28 inches long and the stamped number is 2740. It looks like your replacement part does not have a rolled edge. Does that make a difference?
Tom from SWISCO responded:
May 9, 2017
It does indeed resemble our Series 390 channel balance. This comes with our 19-002 top and 15-001 bottom shoes. As long as you shoes matches up to ours, then this should be a good replacement for you.