I've got a exc 250f /07 had trouble with the original light fitting, tried to find a tail tidy .couldn't find one which would fit properly .So what I did is buy some little led bulbs from Hong Kong and fitted it inside the original tail light .Been fine for ages
dont panic, I didn't realise KTM done an oem one so I'm probably going to go for that. electric faults have always got the better of me and I don't want to risk it with an LED