Based on the photos in the Rock Auto link, I have no idea how you're going to attach the lower end of the shock absorber.
I have zero confidence that those Astro arms fit a K-series.
When it was me, I installed Polyurethane bushings in the original outer shells; no press, no special tooling needed. Propane torch to remove the rubber, and emery cloth to clean-up the inside of the shell.
Worst parts of that job are 1) trying to get the arm to release the torsion bar, otherwise you've gotta do this with the control arm hanging off the end of the torsion bar like I did; and 2) fabricating the inner sleeves for the upper control arm bushings. The bushing supplier gives you inner sleeves for the lower bushings, but not for the uppers. Mine were totally corroded, I had to machine new sleeves out of steel tubing. This was not fun, and took forever to do since I don't own a lathe.
Prying down on the rear of the control arm with a red-handled prybar. Torsion bar has to "bend" a little--but who cares, it's spring steel.
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Warm up the shell--evenly as possible, all the way around--with the propane torch, the rubber poops out. Get it too hot, there's sparks, smoke, and flame. And the smell of burning rubber. Keep a garden hose/fire extinguisher handy.
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One bushing, and old/new inner sleeves for upper control arm
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