| I was looking into the exact same thing a while ago while doing my rear suspension. Only the front lower arm ball joints are available. It's dumb, I know. I ended up being contacted by Tony Popkowski, who I assume lurks here and saw my message. He told me that you could use one from a 1989 Nissan Sentra along with universal dust boots from energy suspension. Unfortunately the Sentra's ball joint isn't maintenance free like the OEM ones on our Z's. Your other option is to buy new rear arms which are about $115 each I believe. I ended up saying the hell with it all and just buying the fancy schmancy ones that SPL sells. They are much much more spendy though. It's too bad you can't just get the lower ball joints, it would be nice to replace both for about $60 instead of buy new arms. Oh, one other thing, if you do try to replace them you'll need a special press to remove them from the arms, don't forget to buy new ball joint seats too as yours will likely be stuck on your old ball joints pretty damn well.
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