I just looked on Eurospares and Scuderia parts and the 3 litre diesel engine has a timing CHAIN (part no 46341482) about £65 from these suppliers more like £95 retail BUT its the fitting that costs . I cant imaging you need to change it at 50K — but the independent or dealer should advise– the accessory belts for various pumps should get checked and advised on condition. I dont know the Ghibli diesel service schedule but they might do these accessory automatically – but you can see this in the servicing info/schedule for the car. With these things the parts aren’t bad but the labour rate especially at dealers causes the headache.
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