That's it all right.
Rubber grommet dimensions:
9/16" OD by 1/4" ID. Fits perfectly, and allows using a 1/4" screw to secure it.
Hillman p/n 881253, available at Lowe's.
Are you sure it wasn't in the box? The first pump came to me shipped in aJohnson box. The second came in a much larger box, with lots of paper, but no small Johnson box. The bracket was still there. Maybe you ought to e-mail them.:shrug:
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