Pretty sure the bushings are the same. Grinding the rivets is not that challenging and by "pressing" we mean borrow a threaded rod tool from Advance/AZ/O'Reilly.
This is the simplest form, there are others.

.

 

LS/LT bushings are hinge style
SS bushings a solid

 

I just watched a youtube where the guy measures the ball joint on a new LCA 20.5mm. It has the same bushing as FE1/FE3.

 

And it had the Gm part number stamped in it , he ordered it from an online parts source

 

I have a set of GM SS-correct LCA's too. I was a bit surprised that they have that "hinged" bushing. Don't care much, because I sure they'd be fine and they'll get the Moog "problem solver" bushings anyway.

But wow, don't watch that vid. The guy has no idea what he's talking about and made at least three misstatements of fact.

 

Yeah, I was compelled to add my remarks.