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Allen-Bradley 450L-AM-TBM - Top/Bottom Mounting brackets
I picked the AQBB because it didn't feel flimsy like some other options out there.
Allen Bradley Brackets Safety Light Curtain Genuine OEM 450L-AM-TBM Top/Bottom
A nice touch with this item is the 530*200*150cm or 208*79*59in, which is roomy yet compact.