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I was actually thinking about using some 1"x1" box tubing... Seem's I recall a 3/8 diameter bolt, but that also might be belt sizes also...

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I believe there is a spec of 3/8 bolts... on my diagonal
bars I came across to the side bars and longitudinal
with the same diameter as the diagonal bars(1 1/8"
I believe) then welded a 1/4" plate with a 90* bend
in it... thats what my seat actually mounts on... if you
look closely where the seat would mount you can
see the spacer to raise the front of my seat
(hard to see being black but you can)