Originally Posted by luvmusl
So is it true that 97 was the only year those were standard?
Yep. They are a cheap and slightly effective way to adjust your caster, but at the expense of damaging the control arm mounts.
There's really not enough clamping surface at the bolt sleeve to keep the mounts in place if you stress them.
The non eccentrics use the big round washer locked into the horseshoes to help somewhat. Slotted holes are a fairly poor system overall given how much stress the axle can see when you put on larger tires.