My experience is that the LC sway bar, even with new bushings/end links, was NOT a sufficient difference. Despite a very well-working AHC, I wish I had gone fatter for less body roll.
You'd need techstream. Refer to this post:
https://forum.ih8mud.com/threads/2004-lx470-transponder-key-programming-instructions.936959/page-6#post-14945484
By the way I had the 'height adjust in N is always off by -6 mm in front and -13mm in rear' earlier in this thread.
...And I fixed it by setting N height to +6 mm in front and +13 mm in rear. (In other words, I added those measurements to the default ride height.)
So now my ride height and...
LX is 23 and LC is 24 mm - see here: Sway bar options for LX470? - https://forum.ih8mud.com/threads/sway-bar-options-for-lx470.1307755/
I upgraded from 23 to 24 mm and I regret making such a conservative change - if I had to do it again I'd go with 27 mm.
Hah I have a '04 LS430 in old guy gold. Awful color, love the car.
And I know what you're saying about the 'whole car same color', but that is sufficiently addressed by buying the REGULAR white.