Unless you’re a total DIY guy, it might be worth biting the bullet and paying mobile service to do it. The new handles are Gen III and require a new wiring harness because they completely redesigned them for extra reliability. I watched them install one of mine under warranty, the new internals are much less complicated, and they eliminated the micro switch completely so that won’t be a failure point. I didn’t see the new paddle gear, but the tech told me it was made of a stronger material