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longer upper ball joint for roll center correction This one I don't understand... the only advantage I can see is maybe more dynamic camber when suspension moves up in a corner, that's all. In a low car (lower arms beyond horizontal) it will raise the roll centre and decrease the change in roll cen...

In 1989, four different modified Watt's link mounts were homologated (A5307, Ext. 30/18V0) for the Alfa 75 Turbo. The images in the homologation papers are quite clear: https://lh6.googleusercontent.com/-_TW9uI41Ku0/UHr2R4IE8hI/AAAAAAAAXZQ/aX994QAU6dA/s800/1989WattMount.jpg However, in 1991 (A5307, ...