This is what I used (copy/paste from another forum.). 3.5" long x 1" wide x 0.305" thick; drill hole dia of 1/2" at 2.25" apart centred 4.125" long x 1" wide x 0.305" thick; drill hole dia of 7/16" at 3.125" apart centred Bolts, four of each grade 10.9: Note: grade 8 imperial = 10.9 metric; grade 5 imperial = 8.8 metric M10x1.5 40mm length M12x1.75 90mm length
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