Any of the AE9x models can be fitted with an AE93 swaybar. I think the AE94 RV also comes with a front swaybar. The AE90 and all the other NON SX models have no front swaybar. But you would also need the front Lower Control Arms as they have the mounts for the swaybar. It is easy to get a full front crossmember with the A arms and swaybar attached. That's what I did on my AE90. Then you can change all the dodgy bushes to new ones while it is on the floor.
The AE101 front swaybar of the front cut I bought, did not fit the AE90. I am not sure if it is compatible with the AE112r etc. Hiro Protagonist would probably know. I would assume all the AE1xx ones will be interchangeable. Can't tell you about rear sway bar upgrades.
NOTE: I think you may be talking about the strut bar as you mention the firewall holes. The AE9x SX front strut bar will fit all AE9X models. Too easy.
The AE101 front strut bar did not fit the AE90 of mine. But I ground out the welds, rotated the ends slightly and fitted it in place on my ae90 and then welded it back up, and it fit just fine.
Again, I am not sure if an AE101 front strut bar will fit the AE112 etc, but I ASSUME they would.
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