The red frame v11 sport (KR) got some bad reviews in Germany and other places, because not as other old Guzzis, it wasn't so stable. They were delivered with 170 wide tire on 4,5", what is a to wide tire for the rim. And that makes the tire shape to pointy. German tuner Dynotec made a corrected version of the first gen V11 sport, other offset triple clamps were part of it. But in Italy, Aprilia just owned Moto Guzzi, and didn't want the bad publicity so they took drastic measures.
The second generation(KS) got a wide tire rear, the popular 180/55 on a 5,5"rim. The area between swingarm and gearbox got a extra steel rods to make it stiffer. with extension to the engine crank case. The front engine mount was reinforced. And the steeringhead was extended to have more wheelbase.
The third generation(KT) kept same geometry but got optical tweaks and the 43mm forks where this subject is about.
Not all changes occurred at the same time, first mount old stock before making new. It has been always the same.
The Dynotec v11 http://www.dynotec.de/presse/DynotecV11_2000MO.html