Rather than buying new bushings for the upper control arms, I would suggest looking into aftermarket upper control arms that offer some level of caster correction. They give extra caster without adjusting the cam tabs on the lower control arms. Naturally when you raise the front suspension on the independent front suspension on the gx you cause the care to get more positive camber and reduce the amount of caster. When getting an alignment you adjust the camber bolts to get the wheels back to more or less where they should be (I think around -.5 degrees). By adding more negative camber (to get the wheels back to the original desired camber amount) it effectively reduces the amount of caster available.
Ideally, if you plan to lift the front by more than say and inch and a half or two inches, you should be looking at replacing the upper arm too.
I still have stock upper arms on my gx (but I only lifted the front about 1.2-1.5 inches) but I do plan to eventually replace my upper arms.
These are the arms that I have been eyeing for my gx when the time comes.
Amazon product ASIN B01NASQA4C
But the sky is the limit on what you want. Some use rubber bushings, poly bushings, delrin bushings, or spherical bearings.
For the control arm bushings, these are the links to my local dealer's catalogue on what they offer.
2003-2009 Lexus GX470 Lower Control Arm Front Bushing 48654-60030
parts.lexusofkendall.com
2003-2009 Lexus GX470 Lower Control Arm Rear Bushing 48655-60030
parts.lexusofkendall.com
2003-2023 Lexus Upper Control Arm Bushing 48632-60040
parts.lexusofkendall.com
2003-2009 Lexus GX470 Lateral Arm Bushing 48706-60060
parts.lexusofkendall.com
That is all I could find with respect to the bushings from the dealer for the control arms.
I did use these bushings on my swaybars and they bolted on perfectly with no issues.
Amazon product ASIN B001CA22H6
Amazon.com: Moog K90559 Sway Bar Bushing Kit: Automotive