Confused by vintage Porsche front struts? Classic Boge, red Koni performance icons (with wider 3.5" brakes), inverted Bilstein silver bodies, plus ball joint types (bolt-on to wedge pins), caliper spacings (3.0" vs 3.5"), and B6 vs B8 choices. Don't miss this guide to picking the right setup for your 911, 912, or 914 refresh.