I actually have a complete manual rack for your car, with 170k miles, but it's my parts hoard for two Echo's driven by my granddaughter and myself. The rack is outer tie rod end to tie rod end and not from a rust belt state. There is a metal collar inside the bushing (it has two on that side), not sure whether it is removable or not but if the bushing is getting sloppy, maybe you could shim it with some aluminum, like the stuff you wrap wood with on houses. Another option would be to have bushings made, but they would have to be capable of being installed, which might be why they are not offered separately, due to difficulty of installation.
At that mileage it might be worthwhile to get a used rack assembly, since there are other wear points that could be at their design limits. If you can get one that is outer tie rod to outer tie rod, then you could replace ALL the wear parts at the same time.
You could install two washers to compress the bushing and tighten things up some, rubber or metal. We used to do that to tighten up the trailing arms on the 280ZXs and 300 ZXs we specialized in working on two decades ago.
As a general rule the collars inside the bushings indicate they can be replaced. They remind me (the bushungs) of some types of sway bar bushings, but finding one that fits correctly could take a lot of time and frustration.