If they were factory springs they should be color coded. According to the Porsche katalog, a standard 996 coupe would have Blue Brown, M030 would be Grey Blue or maybe Silver Blue. example of color coding below. You might also be able to find the strut code on the Bilstein website - some people just change the springs, keep original struts.
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Vince
2015 Boxster S, Black & Black
1989 Carrera Silver Coupe, Silk Grey - sold
2009 Cayman S White, Full Cocoa - sold
1972 911E Silver Coupe, Pepita & Black - sold
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