I asked my dealer about getting the Italian plinth and he came back with two part numbers, 50535783 and 50541383 I'm not sure if these are the long and the short or two different short versions. I contacted AR customer services for more info and they sent back the following dimensions
Part Number - 50535783
Length: 38cm Width: 14cm Height: 3cm
Part Number – 50541383
Length: 25cm Width: 7cm Height: 76cm
These don't seem to make sense. 50535783 is about the right width at 38cm but very thick at 7cm and a bit too tall at 14cm. 50541383 is 3/4 of metre high...not sure what this is.
I've queried this with both AR and the dealer. Waiting for further info