The Eclipse rear (this is NOT a product line from Koni, it's a Koni shock for a Mitsubishi Eclipse) is functionally the same as a Koni S13 rear shock, it's just a few mm shorter overall (doesn't matter if you're lowered) and has a 12mm diameter shaft instead of the S13's 10mm shaft. The larger diameter is necessary to accomodate the adjuster within the shaft, so you can turn the knob at the top to adjust it, instead of removing it from the car like you must do with the S13 shock.
As far as uppers, you just use the Tein plate or the factory mount, with whatever bushings and spacers match up. You can get to the adjuster by opening the trunk. In a coupe you have to cut out some of the trunk trim, but if you've got an upper strut bar you already did that anyway.
For threaded sleeves, you use Ground Control just like with the front. No offense, but Duh!
Here's a pic the first time I installed it, before removing it to ditch the GC upper mount in favor of a Vorshlag unit.
And here's a detail of the top, after some surgery, but showing the adjuster etc.
Like in OptionZero's directions, you just need a spacer under the Tein mount, and a bronze bushing from McMaster to match the Tein plate to the strut shaft. The OD is 18mm and the ID is 12mm, same as the shaft.
Hope that helps.