Non-Polyurethane upper & lower rear control arms?

[Gary Wells]

I am planning on running Global west lower spherical bearing frame side & Del-A-Lum bushing on the opposite end, but I can't find anybody that makes something similiar for the uppers, other than BMR, which from the description of theirs, sounds like a drag-race only recommended design. I am trying to stay away from the squeaking normally associated with rear control arms using polyurethane, and am planning on running double adjustable uppers.
Any ideas, comments, insults, or strokes of genius are welcome.