Toyota does not sell service parts for the driver's side rack mounting bushings. I have been told it is because the way it is manufactured "you" can not reinstall the bushings to factory specs. I have seen replacement bushings through other sources but have never tried to install them. We have a couple of 2000 4Runners in the family. On one of them the bushings were worn out and
the boots were cracked / torn and leaking so I just the replaced the rack and the power steering hose line assy. with brand new Toyota parts. It was pricey but I figured after twenty years it doesn't owe me anything and I won't have to mess with it again.