I bought H&R springs for my 2005 SRT6 Convert and had them installed by an independent Mercedes mechanic. You can find them on eBay. They lower 1" (25mm) and look good. I paid less than $160 for the set about 6 months ago. They charged me about $450 to install them because the front end had to be re-aligned and they had to replace some alignment bolts. I'll post some pix.