Those Eibach struts/shocks should work perfectly with your SR Performance springs. They'll certainly reduce the excessive bouncing you're experiencing and firm up the ride a good bit. Plus, it sounds like you found a sweet deal on a used set, assuming they're in good condition.
Make sure those struts are designed to be used with 11+ strut mounts too, if you're keeping the factory mounts. Otherwise, an 05-10 GT500 strut mount
is required to fit 05-10 struts properly to 11+ Mustangs. Changing over to the 05-10 GT500 mount isn't a big deal either. I would say it's more common for 11+ owners to do so than actually purchasing struts designed for the 11-14 mounts. It's just an added expensive I wanted to make sure you're aware of!
Let me know if the used Eibach's don't work out. We'll find you a setup that performs within your budget!
You're gonna love the ride height and handling of the SR springs! They're even better when paired with a set of performance struts/shocks, of course. Even still, IMO the SR springs are one of the smoothest street springs available when used with factory struts/shocks. Most hardcore racing springs have a much bouncier ride if not paired with performance dampeners.
To answer your question - Yes, most aftermarket dampeners will work perfectly with your SR Springs. What really sets struts/shocks apart is longevity, design, and adjust-ability. All three of these categories are very important, but I would say longevity is the biggest concern with a street car. With that in mind, it's wise to stick with name brand dampeners such as Koni, Bilstein, Tokico, KYB, Eibach, etc
. All of these guys have been in the suspension business for a long time and have fine tuned their dampeners to perfection.
There's a lot of if, and's, or but's, when it comes to suspension components. It's easy to get things mixed up and confused, especially when working around a budget. So feel free to give me a shout if you guys have more questions! We'll figure out a setup that works best for you!