I've been staring at as many spiderbox and other dual arm front ends as I can trying to figure out exactly how they configured the A-arm mounts at the "box" end. I've been considering using the bronze bearings in the a-arm tube along with a same size bronze bearing going through the front and rear plates of the box with the excess length trimmed flush to the inside of the plates and a thrust washer between the two. Trying to avoid having the thru bolt ride against the plate metal, which is how it seems to be from the factory. I like your idea though, cut off the end tube (move it outward between the a-arm legs for rigidity), and install lugs and heims in the ends of the tubes and weld in some grade 8 bolts with enough shoulder area for the heims to ride on..
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