Re: Heico Lowering Springs - S60R or V70R (imageomega)
They are made by Eibach IIRC but they are each matched to one another, and other such fanciness as described on the Heico website (and I spoke to Todd H)
From the website.
The advantage of a HEICO spring set over others can be found in the spring rates themselves, which are carefully tailored to meet HEICO's requirements for comfort, look, and performance. HEICO's spring rates are derived through street and race testing, both on the autobahn, and on the infamous "Green Hell", the 187 corner Nürburgring's North Loop, the world's longest and most varied racing facility. Testing, testing, and more testing is the derived benefit when purchasing a HEICO spring set vis a vis other offerings in the marketplace. For the best balance between comfort, style, and performance, HEICO springs are the solution for Volvo cars.