i apologize to interrupt the discussion about bikers...
just an input if you wanna a bit more air under the hood...

made these spacers a while ago... (sorry, bad quality pics)







not such pedestrian friendly...



not a good looking cossie, just a welded diff...



here the measurements...




the car you see fits the highest ones (50mm).
you can either diy them, with some 5mm metal and washers, or send this .jpg to a laser-cut shop and have them done for cheap.

hope this helpful.