I assume you're talking about the front and rear bars from Addco...they're the only game in town I'm aware of, as far as ready made parts go. It does seem odd the only ones they offer are a 1" rear and .875" front.
edit: Like Tom says, Fabcraft does have a rear sway bar that's 3/4". However, I think it mounts differently than the Addco bar, so the mechanical advantage may be different.
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