My Fiat 850 has a "Faza" spring mount plate in the front and it was once the intention to lower the car a little further with an adapter:
That was not very successful: the overall lowering was limited and alignment became a a bit of a challenge as the camber turned negative quite extremely. Filling up with shims was not enough. So adapters are removed again. I visited the Abarth-online.de stand at the Padua fair and they had something that immediately appealed to me: a new type of adapter, less steel and faster to install and, not unimportantly: without negative camber:
The stance of the car still is not what i want but the car has not driven yet.