for a strut setup like wreck's i'd just tab the arms, add a reinforcing gusset that the tabs go into and have the heim sticking out of the top of the strut. the upper isn't taking the brunt of the load. i run dinky little 3/8ths in my uppers at the spindle end. at the frame end of the arms, they're the 1/2 bore 5/8ths shank.
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