Hi and welcome to the forum.

I’m pretty sure the interior lights in the front of the Leon are a 39mm festoon and two 501 bulbs for the reading lights. The rear lights are a funny little unit, take a look at ToRo’s guide on how to fix them, will give you an idea. I have seen the rear lights changed though to LED but there was a little bit of work involved.

I also am not a fan of Angel Eye headlamps, I prefer the look of the standard lights, although I’m not a fan of HID either, I just run Osram NightBreakers for dipped and main beams and Philips Blue sidelights and that is sufficient for me.