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From what I can gather, the black ones are the stock B4 struts from Bilstein. The yellow ones are the heavy duty B6 struts. Do you want stock stiffness? Get the B4's, rock,,,*** auto carries both types for around $200 each, B8's which are adjustable are only a little more.
I have a set to put in my 2001 base, I got the B4's because I'm fairly easy to please. Autozone, btw, will loan you a nice spring compressor for a $50 deposit.
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2001 Boxster
2007 Toyota Highlander
2003 New Beetle Convertible, Turbo, Tip 6 speed 
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