IMO- the frame mount portion appears about 5" and the spindle itself appears about 6-1/2". I don't know if there's a standard- for a hub to travel vertically without toe-in or out is to have them the spaced the same distance at the frame and spindle. This A-arm set-up appears to have very little travel (4"-6"). It would be good for general driving but not to good for jumps or extremely rough terrain. The spindle/hub- the hub & axle is a typical 4" on 4" trailer type (can be bought at Northern Tools and other places) for about $50. each. The King pin portion looks custom made, but could have come from a golf cart.(this set-up is very heavy and would work best with a bigger tire & wheel)
There are several of us that have made spindles & A-arms.
The things to consider for the front suspension-
the terrain it will be driven on,
your driving style (leisure or aggressive),
the amount of travel/shocks,
the wheels and tires,
& your budget!!!
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