You used to be able to buy the complete front and rear control arms from GM all bushed up and ready to go. The fronts had all the bushings, the upper has the cross shafts installed, and the ball joints installed as well.
The BIGGEST problem was to ensure you got the right bushings with the rear lowers. Conveniently, the standard F-body and G-body shared the same rear LCA there for a while, and while all that was cool, the latest versions before they went disco'ed got "waffle" bushings. This provided even more flexibility and mush of the bushings. You definitely want to replace these style of bushings with minimally a solid rubber bushing.
The thing is, if you got the "1LE" bushings (used in 1LE or FE2 and also the later B4C/FE7 HD suspensions), they weren't really anything other than a firmer durometer solid bushing, just as before. There's been discussions that the 1LE bushing was the same as the regular F body bushing, but I'm super-skeptical since it is not a listed part for a regular F-body suspension. It had a different part number (10164152) than the normal or F-body F41 bushing, and was used throughout the 3rd/4th gen 1LE availability run from 91-02. The LCA also had a different part number than the "normal" F-body rear LCA as well which came with the 1LE/FE2 bushings installed. We know the metal arm itself wasn't different. The bushing was not listed as "fitting" anything else. Hence, it's got its folklore name as the "1LE" bushing.
The GM bushing still shows as a good number, list price of $22.23 each.