Note that the prices listed there are whenever you buy from Maserati factory or Maserati direct. Most of us live in North America on this website meaning we get our parts from Maserati North America whether it's through a private parts source or through the local dealer.
Also Maserati updates pricing VERY frequently. That website hasn't been updated in a long time. I will give them credit for all the work they did. I know I don't have the resources or time to list every part on there.
But anybody who has ever emailed me for spare parts will get an answer with the part #, retail pricing and discounted pricing within a day.