I also changed the lights in my Winnebago RV to LEDs, just like you're planning with your Vectra. Before, I had regular old bulbs, but I read up on
https://leds.to/ and decided to try the OXILAM 2023 Upgraded H11 LED Bulbs.
These new LED lights are way brighter, which significantly helps when driving at night. They were easy to put in and fit just right. They cost a bit more, but they're worth it. The wires are a bit big, and I've heard they might flicker after a few years, but mine have been fine.