If you're going to want to do some basic things to your car and get a little better understanding of it, a very good source to start with is the "Bentley" manual through Amazon or such. It happens to include the 'color' codes of the springs and struts I believe with a colored dot on the parts for I.D. At any rate, it's a good source for info.
I recall that the "sport" vs. "heavy duty" is actually valved the same but the difference is only the length. For instance, if you get a lower spring set, it might be a good idea to get the "sport" (shorter) version. At least that's the way it worked for an older Carrera I had years ago.
good luck,
kj
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