Hi Xavier
Belt is simply a 6PK1534 and you have several options. 1534 is the length in mm. You can easily choose a 1536 mm. Anything between 1534 and 1540 should fit what I know and 1534 is quite short from my experiance
Belt tensioner is same as Alfa 166/GTV/Spider 916 with 2,0l engine.
Belt...