You will need to ring around as these are not easy to find. I would first ring Ross at Merridian and he will be able to advise you if the factory has any, last l heard you could get the main bearings but not the big end bearings. If Merridian can't help then try David Askew or Mcgrath Maserati . If these fail you can get Main bearings from MIE corporation in the USA, also worth contacting Modena Performance in Germany they do lots of spares and are selling the V6 bi turbo big ends on ebay saying they will fit the 3200.
Best of luck
Rex B