Did my rear ambient light conversion yesterday,dead straight forward. And quite pleased with the results Heres what i basically did. 1.remove light unit 2.find centre point of light housing,mark with pencil.then mark out position to drill holes-i went for 40 mm between centres of leds. 3. Drill 2 x 5 mm holes and deburr 4.fit leds and glue in place. 5.once glue had dried.soldered the connections 6. Re fit light unit. 7. Sit back and admire youre handy work!!! I had a look at the guide that was posted further up this thread. Will get some pics up soon!