I also did this but I did have a couple of problems,
1. The Led lamp fell into the reflector assy while I was messing about with it. Given the extra length, thinner contacts etc it comes out of the holder more easily. I retrieved mine with a small neodym magnet on a bit of cord. I was lucky because the LED lamp was magnetic.
2. When I went for the yearly test, They found one of the Leds had failed, I had to refit the normal bulb. This did not show up as a lamp failure over the Canbus because of the internal resistor in the Led lamp! I have gone back to the original bulbs looks yukky but I will sell the car shortly anyway.
M