LOL @ "Good, used, 25 year old ball joints".....
On a serious note... The ball joints themselves aren't serviceable and there's not enough meat on the arm to machine them to fit a press in replacement. Someone did have a set of fronts machined quite a while back to accept a smaller, press-in ball joint from GM but the service life isn't expected to be great. I believe it cost him a couple hundred bucks but the upside is that in 5 years it'll only cost $80 to get them replaced again. Which is WAY better than the $585 Toyota wants. You'd need to talk to an experienced machinist and supply them one for dissection to see if it's possible with the rear arms. Toyota does still sell the arms new.
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