Dave Sr. from SWISCO responded:
April 5, 2023
Hello, In our experience, you don't necessarily need the parallel arm bracket. The 79-264 commercial closer is made to be installed on the header of the door opening. However, with that being said, the 79-264 is normally used on exterior outswing commercial doors rather that interior wood doors like yours. I'm wondering if the 32-507 closer would have been a better choice for your application. Take a look and see what you think. Dimensions for the 32-507 door closer
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