Stelvio shock gets 3 + and 1 -.
1. Shock is approx 10mm longer (330mm eye-to-eye). Yes it fits. +
2. It has a slightly heavier spring, GRiSO is 9.6kg, Stelvio (?) +
3. It has hydraulic pre-load adjustment. +
4. It still has rebound damping adjustment, but DOES NOT have a compression damping adjuster. -
Sport/Breva/Norge shock will fit, and no, it will not be an upgrade.