[DaveW]

Classic Revival suggested wheel specs for the round tube are as follows,

Front;
8" Rim. (9" total width including Beads)
Backspace = 6"
Front space = 3"
Offset = ET38, or 1.5" towards outside of the wheel from the centerline.
Camber = 1.0 to 1.25 deg negative
Caster = 6.0 to 8.0 deg positive
Toe In (total) = 2.5 to 3.0 mm

Rear;
10" Rim. (11" total width including Beads)
Backspace = 6.5"
Front space = 4.5"
Offset = ET25 or 1.0" towards outside of the wheel from the centerline.
Camber = 0.75 deg negative
Toe In (total) = 1.0 to 2.0 mm

Ground height is measured under the main frame rails and is designed at 120mm

I don't have any details for the square tube.