Seen a few people on here have upgraded to LED sidelights, but I've not yet seen a MK3 with them. Until now... bought a set on eBay and fitted them this evening.
Before, horrible yellowness:

Now, nice crisp white lights:


The photos don't really do them justice to be honest, they do look really smart

Didn't even have to remove the headlights (but I now have very grazed knuckles and fingers!). Now I just need whiter headlights to match!
I also bought LED rear lights but unfortunately they are too big for the holes in the back of the light units so they've got to go back