Spot on The Slick Effect... £4.25 GSF and £5 VAG
191 998 135 A - 1 set of mounting parts for the spot lights from VAG.
I think they are a car set, but buy two sets anyway, then you have spare. I have seen them on ebay too.
But for the purest engine experience, displacement has no replacement. All other methods are simply attempts to artificially recreate the benefits of displacement.