FYI anyone with an S14, Energy Suspension now makes Diff bushings for 35$ (+12$ shipping) They're polyurethane and should be pretty decent. Its a better alternative than Solids or Nismo counterparts that are $120+

Energy Suspension Rear Differential bushing 240sx S14:eBay Motors (item 370319084485 end time Jan-21-10 10:14:04 PST)

I just ordered some so I'll let you guys know how they turn out. I have their subframe bushings already and I have no complaints those other than they sit to high.