Everything here is built for a Alfa Romeo, so you aren't reading past parts for somebody else's car. Tell us the model and the year and you'll see only what fits yours. It comes down to the trim and the rear layout, which is what the fit check is looking at.
Coilovers hand you the ride height you want instead of the one a spring kit already chose. Most of them add a knob to soften or firm things up once that height is set. The threaded body means you're setting it by the fender or by corner weight. Better kits move the lower mount so preload stays where the maker put it, cheaper ones slide the perch and change preload as they travel.
The Giulia is the one with the most. Each model page keeps to the kits built for that one, so you're never reading a list that isn't yours.
Which brands make coilovers for Alfa Romeo cars?
Most of what's here for it is KW. You'll find the rest in the brand row further down, so you can go straight to a name you already trust.
What happens if a kit doesn't fit my Alfa Romeo?
We come get it. If we recommended it and it doesn't fit an unmodified car, we arrange the pickup and you get your money back in full. Anything ready to order is out the door in 2 to 7 days.