I got mine without hardware too. Best fit I found was M8 x 25mm.
25mm long is more than enough with a washer under the bolt head and
a lock washer on the bottom with the nut. Could probably have gone with 20mm length.
I got the black powedercoated version so a M10 bolt was too tight to fit the hole but that
may be due to the powdercoating thickness.
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