Typically we offer four-bar/link type suspensions with one fixed bushing because they are more sucesptable to a jam nut backing off while the axle housing articulates. Granted, this usually only occurs in drag-race four-link suspensions. It's also cheaper for the customer to have one fixed end on each link.
I don't see any reason why we couldn't do it with LH/RH threaded links, but it may cost a bit more (more rod ends, custom links, blah blah). I can look into it if you'd like.
The tri 4-bar kit is strictly universal.
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Matt Jones
Mechanical Engineer
Art Morrison Enterprises
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