I have two used RE3792 superflex assemblies. They had a rebuild not too long ago when I redid my control arms, and now that I'm re-doing them again with johnny joints these can go. Still tight and quiet. The threaded portion is not usable, I welded the pieces together when the jam nuts kept backing off. You can cut the tube and just re-use the superflex assembly. Sells new for $39.95 each. Comes with a spare set of races, joints come apart just fine. I can even cut off the tube and sand blast the tube housing if it helps the sale!
$30 for the pair OBO