Bilsteins are very good with HR springs. You can get them at Autozone too and they have a lifetime warranty. One of the few times I recommend a ****** employed box store for a part since if one of them goes bad you literally pull it out, walk in with your receipt and walk out with a new one.
2000 Mustang GT Steeda build #48. Bolt ons, suspension, Novi 2000.
Just because I give you advice, doesn't mean I know more than you. Its just means I've done more stupid ****.