Swapping a Vespa PX200 4th Gear to a T5 4th

I've been driving the scooter for a few months now and rarely ever used 4th gear. It was basically a 3 speed with an overdrive and I'm rarely on dual carriageways very long. So I decided to swap the 4th gear for a PX125 (T5 also) 4th gear to shorten the jump and make it more useful. it does slightly decrease top speed but it will still happily sit at 60 and I never go on motorways so not an issue. Vespa Torque Values- https://beedspeed.com/pages/vespa-rec... Engine Bolt Diagram- https://blog.scooter-center.com/wp-co...