My pivot bars look about identical to your product #26-336. The two differences I notice are
1. Mine only has two holes
2. Stamped number 8909 on mine
Paul from SWISCO responded:
March 9, 2017
I wouldn't worry about the stamp. The number of holes doesn't matter as much, either, as long as the one that is used to screw the pivot bar to the sash is in the same position.